CD74HCT243 Transceiver Datasheet

CD74HCT243 Datasheet, PDF, Equivalent


Part Number

CD74HCT243

Description

Quad-Bus Transceiver

Manufacture

etcTI

Total Page 17 Pages
Datasheet
Download CD74HCT243 Datasheet


CD74HCT243
Data sheet acquired from Harris Semiconductor
SCHS168D
November 1997 - Revised October 2003
CD54HC243, CD74HC243,
CD54HCT243, CD74HCT243
High-Speed CMOS Logic
Quad-Bus Transceiver with Three-State Outputs
[ /Title
(CD74
HCT24
2,
CD74
HC243
,
CD74
HCT24
3)
/Sub-
ject
(High
Speed
CMOS
Logic
Quad-
Features
Description
• Typical Propagation Delay (A to B, B to A) of 7ns at
VCC = 5V, CL = 15pF, TA = 25oC
• Three-State Outputs
• Buffered Inputs
• Fanout (Over Temperature Range)
- Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL Loads
- Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads
• Wide Operating Temperature Range . . . -55oC to 125oC
• Balanced Propagation Delay and Transition Times
• Significant Power Reduction Compared to LSTTL
Logic ICs
• HC Types
- 2V to 6V Operation
- High Noise Immunity: NIL = 30%, NIH = 30% of VCC
at VCC = 5V
• HCT Types
- 4.5V to 5.5V Operation
- Direct LSTTL Input Logic Compatibility,
VIL= 0.8V (Max), VIH = 2V (Min)
- CMOS Input Compatibility, Il 1µA at VOL, VOH
The ’HC243 and ’HCT243 silicon-gate CMOS three-state
bidirectional noninverting buffers are intended for two-way
asynchronous communication between data buses. They
have high-drive-current outputs that enable high-speed oper-
ation when driving large bus capacitances. These circuits
possess the low power dissipation of CMOS circuits and
have speeds comparable to low-power Schottky TTL circuits.
They can drive 15 LSTTL loads.
The states of the output-enable (OEB, OEA) inputs
determine both the direction of flow (A to B, B to A), and the
three-state mode.
Ordering Information
PART NUMBER
CD54HC243F3A
CD54HCT243F3A
CD74HC243E
CD74HC243M
TEMP. RANGE
(oC)
PACKAGE
-55 to 125
14 Ld CERDIP
-55 to 125
14 Ld CERDIP
-55 to 125
14 Ld PDIP
-55 to 125
14 Ld SOIC
Pinout
CD54HC243, CD54HCT243
(CERDIP)
CD74HC243, CD74HCT243
(PDIP, SOIC)
TOP VIEW
OEB 1
NC 2
14 VCC
13 OEA
CD74HC243MT
-55 to 125
14 Ld SOIC
CD74HC243M96
-55 to 125
14 Ld SOIC
CD74HCT243E
-55 to 125
14 Ld PDIP
CD74HCT243M
-55 to 125
14 Ld SOIC
NOTE: When ordering, use the entire part number. The suffix 96
denotes tape and reel. The suffix T denotes a small-quantity reel of
250.
A0 3
12 NC
A1 4
11 B0
A2 5
A3 6
GND 7
10 B1
9 B2
8 B3
CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright © 2003, Texas Instruments Incorporated
1

CD74HCT243
CD54HC243, CD74HC243, CD54HCT243, CD74HCT243
Functional Diagram
‘HC243, ‘HCT243
3
A0
11
B0
4
A1
10
B1
5
A2
9
B2
6
A3
1
OEB
13
OEA
DIRECTION
SELECT LOGIC
8
B3
TRUTH TABLE
HC, HCT243 SERIES
CONTROL INPUTS
DATA PORT STATUS
OEB
OEA
An
Bn
HHO I
LHZZ
HLZZ
LL IO
H= High Voltage Level
L= Low Voltage Level
I= Input
O= Output (Same Level as Input)
Z= High Impedance
To prevent excess currents in the High Z modes all I/O terminals should be terminated with 10k
to 1Mresistors.
2


Features Data sheet acquired from Harris Semicond uctor SCHS168D November 1997 - Revised October 2003 CD54HC243, CD74HC243, CD5 4HCT243, CD74HCT243 High-Speed CMOS Log ic Quad-Bus Transceiver with Three-Stat e Outputs [ /Title (CD74 HCT24 2, CD74 HC243 , CD74 HCT24 3) /Subject (High S peed CMOS Logic Quad- Features Descri ption • Typical Propagation Delay (A to B, B to A) of 7ns at VCC = 5V, CL = 15pF, TA = 25oC • Three-State Output s • Buffered Inputs • Fanout (Over Temperature Range) - Standard Outputs . . . . . . . . . . . . . . . 10 LSTTL L oads - Bus Driver Outputs . . . . . . . . . . . . . 15 LSTTL Loads • Wide Op erating Temperature Range . . . -55oC t o 125oC • Balanced Propagation Delay and Transition Times • Significant P ower Reduction Compared to LSTTL Logic ICs • HC Types - 2V to 6V Operation - High Noise Immunity: NIL = 30%, NIH = 30% of VCC at VCC = 5V • HCT Types - 4.5V to 5.5V Operation - Direct LSTTL I nput Logic Compatibility, VIL= 0.8V (Max), VIH = 2V (Min) - CMOS Input Compatibilit.
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