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MM74HC245A Octal 3-STATE Transceiver
September 1983 Revised February 1999
MM74HC245A Octal 3-STATE Transceiver
General Description
The MM74HC245A 3-STATE bidirectional buffer utilizes advanced silicon-gate CMOS technology, and is intended for two-way asynchronous communication between data buses. It has high drive current outputs which enable high speed operation even when driving large bus capacitances. This circuit possesses the low power consumption and high noise immunity usually associated with CMOS circuitry, yet has speeds comparable to low power Schottky TTL circuits. This device has an active LOW enable input G and a direction control input, DIR. When DIR is HIGH, data flows from the A inputs to the B outputs. When DIR is LOW, data flows from the B inputs to the A outputs. The MM74HC245A transfers true data from one bus to the other. This device can drive up to 15 LS-TTL Loads, and does not have Schmitt trigger inputs. All inputs are protected from damage due to static discharge by diodes to VCC and ground.
Features
s Typical propagation delay: 13 ns s Wide power supply range: 2-6V s Low quiescent current: 80 A maximum (74 HC) s 3-STATE outputs for connection to bus oriented systems s High output drive: 6 mA (minimum) s Same as the 645
Ordering Code:
Order Number MM74HC245AWM MM74HC245ASJ MM74HC245AMTC MM74HC245AN Package Number M20B M20D MTC20 N20A Package Description 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter "X" to the ordering code.
Connection Diagram
Pin Assignments for DIP, SOIC, SOP and TSSOP
Truth Table
Control Inputs G L L H
H = HIGH Level L = LOW Level X = Irrelevant
Operation
DIR L H X B data to A bus A data to B bus Isolation
Top View
(c) 1999 Fairchild Semiconductor Corporation
DS005165.prf
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MM74HC245A
Logic Diagram
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MM74HC245A
Absolute Maximum Ratings(Note 1)
(Note 2) Supply Voltage (VCC ) DC Input Voltage DIR and G pins (VIN) DC Input/Output Voltage (VIN, VOUT) Clamp Diode Current (ICD) DC Output Current, per pin (IOUT) DC VCC or GND Current, per pin (ICC) Storage Temperature Range (TSTG) Power Dissipation (PD) (Note 3) S.O. Package only Lead Temperature (TL) (Soldering 10 seconds) 260C 600 mW 500 mW -0.5 to +7.0V -1.5 to VCC +1.5V -0.5 to VCC +0.5V 20 mA 35 mA 70 mA -65C to +150C
Recommended Operating Conditions
Min Supply Voltage (VCC) DC Input or Output Voltage (VIN, VOUT) Operating Temperature Range (TA) Input Rise/Fall Times (tr, tf) VCC = 2.0V VCC = 4.5V VCC = 6.0V 1000 500 400 ns ns ns 0 -40 VCC +85 V C 2 Max 6 Units V
Note 1: Maximum Ratings are those values beyond which damage to the device may occur. Note 2: Unless otherwise specified all voltages are referenced to ground. Note 3: Power Dissipation temperature derating -- plastic "N" package: - 12 mW/C from 65C to 85C.
DC Electrical Characteristics
Symbol VIH Parameter Minimum HIGH Level Input Voltage VIL Maximum LOW Level Input Voltage VOH Minimum HIGH Level Output Voltage VIN = VIH or VIL |IOUT| 20 A
(Note 4)
VCC 2.0V 4.5V 6.0V 2.0V 4.5V 6.0V 2.0V 4.5V 6.0V 2.0 4.5 6.0 4.2 5.7 0 0 0 0.2 0.2 TA = 25C Typ 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 3.98 5.48 0.1 0.1 0.1 0.26 0.26 0.1 0.5 8.0 TA = -40 to 85C TA = -55 to 125C Guaranteed Limits 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 3.84 5.34 0.1 0.1 0.1 0.33 0.33 1.0 5.0 80 1.5 3.15 4.2 0.5 1.35 1.8 1.9 4.4 5.9 3.7 5.2 0.1 0.1 0.1 0.4 0.4 1.0 10 160 Units V V V V V V V V V V V V V V V V A A A
Conditions
VIN = VIH or VIL |IOUT| 6.0 mA |IOUT| 7.8 mA VOL Maximum LOW Level Output Voltage VIN = VIH or VIL |IOUT| 20 A 2.0V 4.5V 6.0V VIN = VIH or VIL |IOUT| 6.0 mA |IOUT| 7.8 mA IIN IOZ ICC Input Leakage Current (G and DIR) Maximum 3-STATE Output Leakage Current Maximum Quiescent Supply Current VOUT = VCC or GND Enable G = VIH VIN = VCC or GND IOUT = 0 A 6.0V 6.0V VIN = VCC to GND 4.5V 6.0V 6.0V 4.5V 6.0V
Note 4: For a power supply of 5V 10% the worst case output voltages (VOH, and VOL) occur for HC at 4.5V. Thus the 4.5V values should be used when designing with this supply. Worst case VIH and VIL occur at VCC = 5.5V and 4.5V respectively. (The VIH value at 5.5V is 3.85V.) The worst case leakage current (IIN, ICC, and IOZ) occur for CMOS at the higher voltage and so the 6.0V values should be used.
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MM74HC245A
AC Electrical Characteristics
VCC = 5V, TA = 25C, tr = tf = 6ns Symbol tPHL, tPLH tPZH, tPZL tPHZ, tPLZ Parameter Maximum Propagation Delay Maximum Output Enable Time Maximum Output Disable Time CL = 45 pF RL = 1 k CL = 45 pF RL = 1 k CL = 5 pF 18 25 ns Conditions Typ 12 24 Guaranteed Limit 17 35 Units ns ns
AC Electrical Characteristics
VCC = 2.0V to 6.0V, CL = 50 pF, tr = tf = 6ns (unless otherwise specified) Symbol tPHL, tPLH Parameter Maximum Propagation Delay Conditions CL = 50 pF CL = 150 pF CL = 50 pF CL = 150 pF CL = 50 pF CL = 150 pF tPZH, tPZL Maximum Output Enable Time RL = 1 k CL = 50 pF CL = 150 pF CL = 50 pF CL = 150 pF CL = 50 pF CL = 150 pF tPHZ, tPLZ Maximum Output Disable Time RL = 1 k CL = 50 pF CL=50 pF 2.0V 2.0V 4.5V 4.5V 6.0V 6.0V 2.0V 4.5V 6.0V tTLH, tTHL Output Rise and Fall Time 2.0V 4.5V 6.0V CPD CIN CIN/OUT Power Dissipation Capacitance (Note 5) Maximum Input Capacitance Maximum Input/Output Capacitance, A or B
Note 5: CPD determines the no load dynamic power consumption, PD=CPD VCC2 f+ICC VCC, and the no load dynamic current consumption, IS=CPD VCC f+ICC.
VCC 2.0V 2.0V 4.5V 4.5V 6.0V 6.0V
TA = 25C Typ 31 41 13 17 11 14 71 81 26 31 21 25 39 20 18 20 6 5 50 5 5 15 10 20 90 96 18 22 15 19 190 240 38 48 32 41 135 27 23 60 12 10
TA = -40 to 85C TA = -55 to 125C Guaranteed Limits 113 116 23 28 19 23 240 300 48 60 41 51 169 34 29 75 15 13 135 128 27 33 23 28 285 360 57 72 48 61 203 41 34 90 18 15
Units ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns ns pF pF
G = VIL G = VIH
10 20
10 20
pF pF
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MM74HC245A
Physical Dimensions inches (millimeters) unless otherwise noted
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300" Wide Package Number M20B
20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide Package Number M20D 5 www.fairchildsemi.com
MM74HC245A
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide Package Number MTC20
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MM74HC245A Octal 3-STATE Transceiver
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide Package Number N20A
LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 2. A critical component in any component of a life support 1. Life support devices or systems are devices or systems device or system whose failure to perform can be reawhich, (a) are intended for surgical implant into the sonably expected to cause the failure of the life support body, or (b) support or sustain life, and (c) whose failure device or system, or to affect its safety or effectiveness. to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the www.fairchildsemi.com user.
Fairchild does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and Fairchild reserves the right at any time without notice to change said circuitry and specifications.

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