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74LCX646 Datasheet(PDF) 1 Page - STMicroelectronics

Part No. 74LCX646
Description  LOW VOLT. CMOS OCTAL BUS TRANSCEIVER/REGISTER WITH 5 VOLT TOLERANT INPUTS AND OUTPUTS(3-STATE)
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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74LCX646 Datasheet(HTML) 1 Page - STMicroelectronics

 
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1/13
September 2001
s
5V TOLERANT INPUTS AND OUTPUTS
s
HIGH SPEED :
tPD = 7.0 ns (MAX.) at VCC = 3V
s
POWER DOWN PROTECTION ON INPUTS
AND OUTPUTS
s
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24mA (MIN) at VCC = 3V
s
PCI BUS LEVELS GUARANTEED AT 24 mA
s
BALANCED PROPAGATION DELAYS:
tPLH tPHL
s
OPERATING VOLTAGE RANGE:
VCC(OPR) = 2.0V to 3.6V (1.5V Data
Retention)
s
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 646
s
LATCH-UP PERFORMANCE EXCEEDS
500mA (JESD 17)
s
ESD PERFORMANCE:
HBM > 2000V (MIL STD 883 method 3015);
MM > 200V
DESCRIPTION
The 74LCX646 is a low voltage CMOS OCTAL
BUS
TRANSCEIVER
AND
REGISTER
(3-STATE) fabricated with sub-micron silicon gate
and double-layer metal wiring C2MOS technology.
It is ideal for low power and high speed 3.3V
applications; it can be interfaced to 5V signal
environment for both inputs and outputs.
This device consists of bus transceiver circuits
with 3 state, D-type flip-flops, and control circuitry
arranged for multiplexed transmission of data
directly from the input bus or from the internal
registers. Data on the A or B bus will be clocked
into register on the low to high transition of the
appropriate clock pin (Clock AB or Clock BA).
Enable (G) and direction (DIR) pins are provided
to control
the
transceiver
functions. In the
transceiver
mode,
data
present
at
the
high-impedance port may be stored in either
register or in both. The select controls (Select AB
select BA) can multiplex stored and real time
(transparent mode) data. The direction control
determines which bus will receive data when
enable G is active (low). In the isolation mode
74LCX646
LOW VOLT. CMOS OCTAL BUS TRANSCEIVER/REGISTER
WITH 5 VOLT TOLERANT INPUTS AND OUTPUTS(3-STATE)
PIN CONNECTION AND IEC LOGIC SYMBOLS
ORDER CODES
PACKAGE
TUBE
T & R
SOP
74LCX646M1R
74LCX646RM13TR
TSSOP
74LCX646TTR
TSSOP
SOP


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