INTEGRATED CIRCUITS 74F244/74F244B Octal buffers (3-State) Product specification 1994 Dec 05 IC15 Data Handbook Philips Semiconductors

Philips Semiconductors Product specification Octal buffers (3-State) 74F244/74F244B FEATURES DESCRIPTION •Octal bus interface The 74F244 is an octal buffer that is ideal for driving bus lines of buffer memory address registers. The outputs are all capable of • 3-State output buffer sink 64mA sinking 64mA and sourcing up to 15mA, producing very good • capacitive drive characteristics. The device features two output 15mA source current enables, OEa and OEb, each controlling four of the 3-State outputs. • Guaranteed output skew less than 2.0ns (74F244B) The 74F244B is functionally equivalent to the 74F244. It has been • Reduced ground bounce (74F244B) designed to reduce effects of ground noise. Other advantages are • noted in the features. Reduced ICC (74F244B) • Reduced loading (74F244B IIL = 40m A) TYPICAL TYPICAL SUPPLY • TYPE PROPAGATION Split lead frame offers increased noise immunity (74F244B) CURRENT (TOTAL) DELAY • Industrial temperature range available (-40°C to +85°C) for 74F244 4.0ns 53mA 74F244 74F244B 4.0ns 33mA • 74F244 available in SSOP Type II package ORDERING INFORMATION ORDER CODE COMMERCIAL RANGE INDUSTRIAL RANGE PPKKGG DDWWGG ## DESCRIPTION VCC = 5V ±10%, VCC = 5V ±10%, ° ° ° ° Tamb = 0 C to +70 C Tamb = -40 C to +85 C 20-pin plastic DIP N74F244N, N74F244BN I74F244N SOT146-1 20-pin plastic SOL N74F244D, N74F244BD I74F244D SOT163-1 20-pin plastic SSOP II N74F244DB SOT339-1 INPUT AND OUTPUT LOADING AND FAN OUT TABLE 74F (U.L.) LOAD VALUE PINS DESCRIPTION HIGH/LOW HIGH/LOW Ian, Ibn Data inputs (74F244) 1.0/2.67 20m A/1.6mA Data inputs (74F244B) 1.0/0.067 20m A/40m A OEa, OEb Output enable inputs (active low) (74F244) 1.0/1.67 20m A/1.0mA Output enable inputs (active low) (74F244B) 1.0/0.067 20m A/40m A Yan, Ybn Data outputs 750/106.7 15mA/64mA NOTE: One (1.0) FAST unit load is defined as: 20m A in the high state and 0.6mA in the low state. PIN CONFIGURATION LOGIC SYMBOL OEa 1 20 VCC 2 4 6 8 17 15 13 11 Ia0 2 19 OEb Yb0 3 18 Ya0 Ia0 Ia1 Ia2 Ia3 Ib0 Ib1 Ib2 Ib3 Ia1 4 17 Ib0 Yb1 5 16 Ya1 1 OEa Ia2 6 15 Ib1 19 OEb Yb2 7 14 Ya2 Ya0 Ya1 Ya2 Ya3 Yb0 Yb1 Yb2 Yb3 Ia3 8 13 Ib2 Yb3 9 12 Ya3 18 16 14 12 3 5 7 9 GND 10 11 Ib3 VCC = Pin 20 GND = Pin 10 SF00227 SF00228 1994 Dec 5 2 853-0357 14381

Philips Semiconductors Product specification Octal buffers (3-State) 74F244/74F244B IEC/IEEE SYMBOL FUNCTION TABLE INPUTS OUTPUTS 1 EN1 OEa Ia OEb Ib Ya Yb 19 EN2 L L L L L L 2 2D 1 18 L H L H H H 4 16 H X H X Z Z 6 14 NOTES: 8 12 H = High voltage level 17 2 3 L = Low voltage level 15 5 X = Don’t care Z = High impedance ”off” state 13 7 11 9 SF00229 LOGIC DIAGRAM Ia0 2 18 Ya0 Ib0 17 3 Yb0 Ia1 4 16 Ya1 Ib1 15 5 Yb1 Ia2 6 14 Ya2 Ib2 13 7 Yb2 Ia3 8 12 Ya3 Ib3 11 9 Yb3 OEa 1 OEb 19 VCC = Pin 20 GND = Pin 10 SF00230 1994 Dec 5 3

Philips Semiconductors Product specification Octal buffers (3-State) 74F244/74F244B ABSOLUTE MAXIMUM RATINGS (Operation beyond the limit set forth in this table may impair the useful life of the device. Unless otherwise noted these limits are over the operating free air temperature range.) SYMBOL PARAMETER RATING UNIT VCC Supply voltage -0.5 to +7.0 V VIN Input voltage -0.5 to +7.0 V IIN Input current -30 to +5 mA VOUT Voltage applied to output in high output state -0.5 to VCC V IOUT Current applied to output in low output state 128 mA ° Commercial range 0 to +70 C TTamb OOperattiing ffree aiir ttemperatture range Industrial range ° -40 to +85 C (74F244 only) Tstg Storage temperature range -65 to +150 °C RECOMMENDED OPERATING CONDITIONS LIMITS SSYYMMBBOOLL PPAARRAAMMEETTEERR UUNNIITT MIN NOM MAX VCC Supply voltage 4.5 5.0 5.5 V VIN High-level input voltage 2.0 V VIL Low-level input voltage 0.8 V IIK Input clamp current –18 mA IOH High-level output current –15 mA iol Low-level output current 64 mA ° Commercial range 0 +70 C TTamb OOperattiing ffree aiir ttemperatture range Industrial range ° –40 +85 C (74F244 only) 1994 Dec 5 4

Philips Semiconductors Product specification Octal buffers (3-State) 74F244/74F244B DC ELECTRICAL CHARACTERISTICS (Over recommended operating free-air temperature range unless otherwise noted.) TEST LIMITS SSYYMMBBOOLL PPAARRAAMMEETTEERR CONDITIONS1 MIN TYP2 MAX UUNNIITT VCC = MIN, IOH = -3mA ±10%VCC 2.5 V VOH High-level output voltage VIL = MAX, ±5%VCC 2.7 3.4 V VIH = MIN IOH = -15mA ±10%VCC 2.0 V ±5%VCC 2.0 V VOL Low-level output voltage VVCILC = = M MAIXN,, IOL = MAX ±10%VCC 0.55 V VIH = MIN, ±5%VCC 0.42 0.55 V VIK Input clamp voltage VCC = MIN, II = IIK -0.73 -1.2 V II Input current at maximum input voltage VCC = MAX, VI = 7.0V 100 m A IIH High-level input current VCC = MAX, VI = 2.7V 20 m A 74F244 OEa, OEb -1.0 mA IIL Low-level input current 74F244 Ian, Ibn VCC = MAX, VI = 0.5V -1.6 mA 74F244B all inputs -40 m A IOZH Ohifgf-hs-tlaetvee lo vuotpltuatg ceu arrpepnlite,d VCC = MAX, VO = 2.7V 50 m A IOZL Olofwf--sletavteel ovuotltpaugte c auprrpelniet,d VCC = MAX, VO = 0.5V -50 m A IOS Short-circuit output current3 VCC = MAX -100 -225 mA ICCH 40 60 mA 74F244 ICCL VCC = MAX 60 90 mA ICC Supply current (total) ICCZ 60 90 mA ICCH 20 30 mA 74F244B ICCL VCC = MAX 50 70 mA ICCZ 29 40 mA NOTES: 1. For conditions shown as MIN or MAX, use the appropriate value specified under recommended operating conditions for the applicable type. ° 2. All typical values are at VCC = 5V, Tamb = 25 C. 3. Not more than one output should be shorted at a time. For testing IOS, the use of high-speed test apparatus and/or sample-and-hold techniques are preferable in order to minimize internal heating and more accurately reflect operational values. Otherwise, prolonged shorting of a high output may raise the chip temperature well above normal and thereby cause invalid readings in other parameter tests. In any sequence of parameter tests, IOS tests should be performed last. 1994 Dec 5 5

Philips Semiconductors Product specification Octal buffers (3-State) 74F244/74F244B AC ELECTRICAL CHARACTERISTICS FOR 74F244 A PORT LIMITS ° ° ° ° ° Tamb = +25 C Tamb = 0 C to +70 C Tamb = -40 C to +85 C ± ± SYMBOL PARAMETER TEST VCC = +5.0V VCC = +5.0V 10% VCC = +5.0V 10% UNIT CONDITION CL = 50pF, CL = 50pF, CL = 50pF, RL = 500W RL = 500W RL = 500W MIN TYP MAX MIN MAX MIN MAX tPLH Propagation delay Waveform 1 2.5 4.0 5.2 2.0 6.2 1.5 7.0 ns tPHL Ian, Ibn to Yn 2.5 4.0 5.2 2.0 6.5 2.0 7.0 tPZH Output enable time Waveform 2 2.0 4.3 5.7 2.0 6.7 2.0 8.0 ns tPZL to high or low Waveform 4 2.0 5.0 7.0 2.0 8.0 2.0 8.5 tPHZ Output disable time Waveform 2 1.5 2.5 5.5 1.0 6.0 1.0 6.0 ns tPLZ from high or low Waveform 4 1.5 2.5 5.5 1.0 5.5 1.0 5.5 AC ELECTRICAL CHARACTERISTICS FOR 74F244B LIMITS ° ° ° Tamb = +25 C Tamb = 0 C to +70 C ± SYMBOL PARAMETER TEST VCC = +5.0V VCC = +5.0V 10% UNIT CONDITION CL = 50pF, RL = 500W CL = 50pF, RL = 500W MIN TYP MAX MIN MAX tPLH Propagation delay Waveform 1 2.5 4.5 5.7 2.0 6.2 ns tPHL Ian, Ibn to Yn 2.5 4.5 6.0 2.5 6.5 tPZH Output enable time Waveform 2 2.0 4.0 6.0 2.0 6.5 ns tPZL to high or low level Waveform 4 3.0 5.5 7.5 3.0 8.0 tPHZ Output disable time Waveform 2 1.5 2.5 5.5 1.0 6.0 ns tPLZ from high or low level Waveform 4 1.5 2.5 5.5 1.0 5.5 tsk(0) Output skew1, 2 Waveform 3 1.5 2.0 ns NOTES: 1. |tPN actual - tPM actual| for any output compared to any other output where N and M are either LH or HL. 2. Skew times are valid only under same test conditions (temperature, VCC, loading, etc.,). 1994 Dec 5 6

Philips Semiconductors Product specification Octal buffers (3-State) 74F244/74F244B AC WAVEFORMS For all waveforms, VM = 1.5V. Ian, Ibn VM VM Yn, Yn VM tPLH tPHL tsk(0) Yn VM VM Yn, Yn VM SF00231 SF00232 Waveform 1. Propagation Delay for data to outputs Waveform 3. Output skew OEn VM VM OEn VM VM tPZH tPHZ tPZL tPLZ 3.5V VOH–0.3V Yn VM Yn VM 0V VOL+0.3V SF00233 SF00234 Waveform 2. 3-State output enable time to high level Waveform 4. 3-State output enable time to low level and output disable time from high level and output disable time from low level TEST CIRCUIT AND WAVEFORMS SWITCH POSITION TEST SWITCH tw AMP (V) 90% 90% tPLZ, tPZL closed VCC 7.0V NPUEGLSAETIVE VM VM All other open 10% 10% 0V VIN VOUT RL tTHL (tf ) tTLH (tr ) PULSE D.U.T. GENERATOR tTLH (tr ) tTHL (tf ) RT CL RL AMP (V) 90% 90% POSITIVE PULSE VM VM Test circuit for 3-State outputs 10% 10% DEFINITIONS: tw 0V RL = Load resistor; see AC electrical characteristics for Input pulse definition value. CL = Load capacitance includes jig and probe family INPUT PULSE REQUIREMENTS capacitance; see AC electrical characteristics for value amplitude VM rep. rate tw tTLH tTHL RT = Termination resistance should be equal to ZOUT of 74F 3.0V 1.5V 1MHz 500ns 2.5ns 2.5ns pulse generators. SF000235 1994 Dec 5 7

Philips Semiconductors Product specification Octal buffers (3-State) 74F244/74F244B DIP20: plastic dual in-line package; 20 leads (300 mil) SOT146-1 1994 Dec 05 8

Philips Semiconductors Product specification Octal buffers (3-State) 74F244/74F244B SO20: plastic small outline package; 20 leads; body width 7.5 mm SOT163-1 1994 Dec 05 9

Philips Semiconductors Product specification Octal buffers (3-State) 74F244/74F244B SSOP20: plastic shrink small outline package; 20 leads; body width 5.3 mm SOT339-1 1994 Dec 05 10

Philips Semiconductors Product specification Octal buffers (3-State) 74F244/74F244B NOTES 1994 Dec 05 11

Philips Semiconductors Product specification Octal buffers (3-State) 74F244/74F244B DEFINITIONS Data Sheet Identification Product Status Definition This data sheet contains the design target or goal specifications for product development. Specifications Objective Specification Formative or in Design 9397-750-05103 may change in any manner without notice. This data sheet contains preliminary data, and supplementary data will be published at a later date. Philips Preliminary Specification Preproduction Product Semiconductors reserves the right to make changes at any time without notice in order to improve design and supply the best possible product. This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changes Product Specification Full Production at any time without notice, in order to improve design and supply the best possible product. Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products, including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. Philips Semiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright, or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or mask work right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testing or modification. LIFE SUPPORT APPLICATIONS Philips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices, or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expected to result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling Philips Semiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fully indemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale. Philips Semiconductors Philips Semiconductors and Philips Electronics North America Corporation 811 East Arques Avenue register eligible circuits under the Semiconductor Chip Protection Act. P.O. Box 3409  Copyright Philips Electronics North America Corporation 1996 Sunnyvale, California 94088–3409 All rights reserved. Printed in U.S.A. Telephone 800-234-7381 (print code) Date of release: October 28, 1991 Document order number: 9397-750-05103