
SN54HCT652, SN74HCT652
OCTAL BUS TRANSCEIVERS AND REGISTERS
WITH 3-STATE OUTPUTS
SCLS179D – MARCH 1984 – REVISED MARCH 2003
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
D Operating Voltage Range of 4.5 V to 5.5 V
D Low Power Consumption, 80-A Max ICC
D Typical tpd = 12 ns
D ±6-mA Output Drive at 5 V
D Low Input Current of 1 A Max
D Inputs Are TTL-Voltage Compatible
D Independent Registers and Enables for
A and B Buses
D Multiplexed Real-Time and Stored Data
D True Data Paths
D High-Current 3-State Outputs Can Drive Up
To 15 LSTTL Loads
SN54HCT652 ...JT OR W PACKAGE
SN74HCT652 . . . DW OR NT PACKAGE
(TOP VIEW)
SN54HCT652 . . . FK PACKAGE
(TOP VIEW)
NC – No internal connection
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
CLKAB
SAB
OEAB
A1
A2
A3
A4
A5
A6
A7
A8
GND
VCC
CLKBA
SBA
OEBA
B1
B2
B3
B4
B5
B6
B7
B8
32 1
13 14
5
6
7
8
9
10
11
OEBA
B1
B2
NC
B3
B4
B5
A1
A2
A3
NC
A4
A5
A6
4
15 16 17 18
A8
GND
NC
B8
B7
B6
OEAB
SAB
CLKAB
NC
28 27 26
25
24
23
22
21
20
19
12
A7
CLKBA
SAB
CC
V
description/ordering information
The ’HCT652 devices consist of bus-transceiver circuits, D-type flip-flops, and control circuitry arranged for
multiplexed transmission of data directly from the data bus or from the internal storage registers. Output-enable
(OEAB and OEBA) inputs are provided to control the transceiver functions. Select-control (SAB and SBA) inputs
are provided to select real-time or stored data transfer. A low input level selects real-time data; a high input level
selects stored data. Figure 1 illustrates the four fundamental bus-management functions that can be performed
with these devices.
ORDERING INFORMATION
TA
PACKAGE
ORDERABLE
PART NUMBER
TOP-SIDE
MARKING
PDIP – NT
Tube
SN74HCT652NT
–40
°C to 85°C
SOIC
DW
Tube
SN74HCT652DW
HCT652
SOIC – DW
Tape and reel
SN74HCT652DWR
HCT652
CDIP – JT
Tube
SNJ54HCT652JT
–55
°C to 125°C
CFP – W
Tube
SNJ54HCT652W
LCCC – FK
Tube
SNJ54HCT652FK
Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines
are available at www.ti.com/sc/package.
Copyright
2003, Texas Instruments Incorporated
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information current as of publication date. Products conform to
specifications per the terms of Texas Instruments standard warranty.
Production processing does not necessarily include testing of all
parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.