MOTOROLA MC74ACT245ML1, MC74ACT245ML2, MC74ACT245MR1, MC74ACT245MR2, MC74ACT245DTR2 Datasheet

Octal Bidirectional Transceiver with 3 State Inputs/Outputs

The MC74AC245/74ACT245 contains eight non-inverting bidirectional buffers with 3-state outputs and is intended for bus-oriented applications. Current sinking capability is 24 mA at both the A and B ports. The Transmit/Receive (T/R) input determines the direction of data flow through the bidirectional transceiver. Transmit (active-HIGH) enables data from A ports to B ports; Receive (active-LOW) enables data from B ports to A ports. The Output Enable input, when HIGH, disables both A and B ports by placing them in a High Z condition.

•Noninverting Buffers

•Bidirectional Data Path

•A and B Outputs Source/Sink 24 mA

•′ACT245 Has TTL Compatible Inputs

VCC	OE	B0	B1	B2	B3	B4	B5	B6	B7
20	19	18	17	16	15	14	13	12	11
1	2	3	4	5	6	7	8	9	10
T/R	A0	A1	A2	A3	A4	A5	A6	A7	GND

PIN NAMES

OE	Output Enable Input
T/R	Transmit/Receive Input
A0±A7	Side A 3-State Inputs or 3-State Outputs
B0±B7	Side B 3-State Inputs or 3-State Outputs

TRUTH TABLES

Inputs			Outputs
OE		T/R
L		L	Bus B Data to Bus A
L		H	Bus A Data to Bus B
H		X	High Z State

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

MC74AC245

MC74ACT245

OCTAL BIDIRECTIONAL

TRANSCEIVER

WITH 3-STATE

INPUTS/OUTPUTS

N SUFFIX

CASE 738-03

PLASTIC

DW SUFFIX

CASE 751D-04

PLASTIC

FACT DATA

5-1

MC74AC245 MC74ACT245

MAXIMUM RATINGS*

Symbol	Parameter	Value	Unit
VCC	DC Supply Voltage (Referenced to GND)	±0.5 to +7.0	V
Vin	DC Input Voltage (Referenced to GND)	±0.5 to VCC +0.5	V
Vout	DC Output Voltage (Referenced to GND)	±0.5 to VCC +0.5	V
Iin	DC Input Current, per Pin	±20	mA
Iout	DC Output Sink/Source Current, per Pin	±50	mA
ICC	DC VCC or GND Current per Output Pin	±50	mA
Tstg	Storage Temperature	±65 to +150	°C

*Maximum Ratings are those values beyond which damage to the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.

RECOMMENDED OPERATING CONDITIONS

	Symbol	Parameter		Min	Typ	Max	Unit
	VCC	Supply Voltage	′AC	2.0	5.0	6.0	V
			′ACT	4.5	5.0	5.5
	Vin, Vout	DC Input Voltage, Output Voltage (Ref. to GND)		0		VCC	V
		Input Rise and Fall Time (Note 1)	VCC @ 3.0 V		150
	tr, tf		VCC @ 4.5 V		40		ns/V
		′AC Devices except Schmitt Inputs
			VCC @ 5.5 V		25
	tr, tf	Input Rise and Fall Time (Note 2)	VCC @ 4.5 V		10		ns/V
		′ACT Devices except Schmitt Inputs	VCC @ 5.5 V		8.0
	TJ	Junction Temperature (PDIP)				140	°C
	TA	Operating Ambient Temperature Range		±40	25	85	°C
	IOH	Output Current Ð High				±24	mA
	IOL	Output Current Ð Low				24	mA

1.Vin from 30% to 70% VCC; see individual Data Sheets for devices that differ from the typical input rise and fall times.

2.Vin from 0.8 V to 2.0 V; see individual Data Sheets for devices that differ from the typical input rise and fall times.

FACT DATA

5-2