Samsung HT-DL100, Service Manual

Page: 3 / 71

Samsung Electronics 8-1
8. IC Block Digrams
8-1 Main
1. 74CX244
LOW VOLTAGE CMOS OCTAL BUS BUFFER (3-STATE)
WITH 5V TOLERANT INPUTS AND OUTPUTS
ORDER CODES :
74LCX244M 74LCX244T
M
(Micro Package)
■
5V TOLERANT INPUTS AND OUTPUTS
■
HIGH SPEED:
t
PD
= 6.5 ns (MAX.) at V
CC
= 3V
■
POWER-DOWN PROTECTION ON INPUTS
AND OUTPUTS
■
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 24 mA (MIN)
■
PCI BUS LEVELS GUARANTEED AT 24mA
■
BALANCED PROPAGATION DELAYS:
t
PLH
@
t
PHL
■
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2.0V to 3.6V (1.5V Data Retention)
■
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 244
■
LATCH-UP PERFORMANCE EXCEEDS 500mA
■
ESD PERFORMANCE:
HBM >2000V; MM > 200V
DESCRIPTION
The LCX244 is a low voltage CMOS OCTAL BUS
BUFFER
(NON-INVERTED) fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS technology. It is ideal for low
power and high speed 3.3V applications; it can
be interfaced to 5V signal environment for both
T
(TSSOP Package)
inputs and outputs.
It has same speed performance at 3.3V than 5V
AC/ACT family, combined with a lower power
consumption.
This device is designed to be used with 3 state
memory address drivers, etc.
All inputs
and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS