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SN74CBT3245A Datasheet, PDF (1/15 Pages) Texas Instruments – OCTAL FET BUS SWITCH
D Standard ’245-Type Pinout
D 5-Ω Switch Connection Between Two Ports
DB, DBQ, DGV, DW, OR PW PACKAGE
(TOP VIEW)
NC 1
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
A8 9
GND 10
20 VCC
19 OE
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
NC − No internal connection
SN74CBT3245A
OCTAL FET BUS SWITCH
SCDS002Q − NOVEMBER 1992 − REVISED DECEMBER 2004
D TTL-Compatible Input Levels
RGY PACKAGE
(TOP VIEW)
1
A1 2
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
A8 9
10
20
19 OE
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11
GQN OR ZQN PACKAGE
(TOP VIEW)
1234
A
B
C
D
E
NC − No internal connection
terminal assignments
1
2
3
4
A
A1
B
A3
NC
VCC
OE
B2
A2
B1
C
A5
A4
B4
B3
D
A7
B6
A6
B5
E
GND
A8
B8
B7
NC − No internal connection
description/ordering information
The SN74CBT3245A provides eight bits of high-speed TTL-compatible bus switching. The SOIC, SSOP,
TSSOP, and TVSOP packages provide a standard ’245 device pinout. The low on-state resistance of the switch
allows connections to be made with minimal propagation delay.
The device is organized as one 8-bit switch. When the output-enable (OE) input is low, the switch is on, and
port A is connected to port B. When OE is high, the switch is open, and the high-impedance state exists between
the two ports.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
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.
PRODUCTION DATA information is 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.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright  2004, Texas Instruments Incorporated
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