IDT74FCT833A/B
FAST CMOS PARITY BUS TRANSCEIVER
COMMERCIAL TEMPERATURE RANGE
IDT74FCT833A/B
FAST CMOS PARITY
BUS TRANSCEIVER
FEATURES:
DESCRIPTION:
• Equivalent to AMD's Am29833 bipolar registers in pinout/
function, speed, and output drive over full temperature and
voltage supply extremes
• High-speed bidirectional bus transceiver for processororganized devices
• IDT74FCT833A equivalent to Am29833 speed and output drive
• IDT74FCT833B 30% faster than Am29833
• Buffered direction and 3-state controls
• Error flag with open-drain output
• IOL = 48mA
• TTL input and output level compatible
• CMOS output level compatible
• Substantially lower input current levels than AMD's bilopar
Am29800 series (5µA max.)
µ
• Available in SOIC package
The IDT74FCT833s 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 OET and OER are used to force the port outputs to the
high-impedance state so that the device can drive bus lines directly. In
addition, OER and OET can be 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 output
sink current over the commercial temperature range.
FUNCTIONAL BLOCK DIAGRAM
RI
8
TI
8
15
OE T
OER
PARITY
14
1
8
8
S
MUX
9
9-BIT PARITY TREE
10
D
Q
P
CLK
13
ERR
Q
CP
CLR
CLR
11
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
COMMERCIAL TEMPERATURE RANGE
JULY 2000
1
© 2000 Integrated Device Technology, Inc.
DSC-4621/3