Integrated Device Technology, Inc.

MILITARY AND COMMERCIAL TEMPERATURE RANGES

MAY 1992

©1992 Integrated Device Technology, Inc.

7.21

DSC-4621/2

®

FAST CMOS

PARITY BUS

TRANSCEIVER

FEATURES:

• Equivalent to AMD’s Am29833 bipolar parity bus

transceiver in pinout/function, speed and output drive

over full temperature and voltage supply extremes

• High-speed bidirectional bus transceiver for processor-

organized devices

• IDT54/74FCT833A equivalent to Am29833A speed and

output drive

• IDT54/74FCT833B 30% faster than Am29833A

• Buffered direction and three-state controls

• Error flag with open-drain output

• TTL input and output level compatible

• CMOS output level compatible

• Substantially lower input current levels than AMD’s

bipolar Am29800 series (5

µA max.)

• Available in plastic DIP, CERDIP, LCC and SOIC

• Product available in Radiation Tolerant and Radiation

Enhanced versions

• Military product compliant to MIL-STD-883, Class B

DESCRIPTION:

The IDT54/74FCT833s are high-performance bus

transceivers designed for two-way communications. They

each contain an 8-bit data path from the R (port) to the T (port),

an 8-bit data path from the T (port) to the R (port), and a 9-bit

parity checker/generator. The error flag can be clocked and

stored in a register and read at the

ERR output. The clear

(

CLR) input is used to clear the error flag register.

The output enables

port outputs to the high-impedance state so that the device

can drive bus lines directly. In addition,

used to force a parity error by enabling both lines

simultaneously. This transmission of inverted parity gives the

designer more system diagnostic capability. The devices are

specified at 48mA and 32mA output sink current over the

commercial and military temperature ranges, respectively.

The IDT logo is a registered trademark of Integrated Device Technology, Inc.

FUNCTIONAL BLOCK DIAGRAM

S

MUX

9-BIT

PARITY TREE

9

8

8

8

T

D

CLR

CP

Q

Q

PARITY

CLK

CLR

ERR

2557 drw 01

P

8

I

IDT54/74FCT833A

IDT54/74FCT833B

1