74LCX16244
Low voltage CMOS 16-bit bus buffer (3-state)
with 5V tolerant inputs and outputs
Features
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■
■
■
■
■
■
■
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5V tolerant inputs and outputs
High speed:
– t
PD
= 4.5ns (Max) at V
CC
= 3V
Power down protection on inputs and outputs
Symmetrical output impedance:
– |I
OH
| = I
OL
= 24mA (Min) at V
CC
= 3V
PCI bus levels guaranteed at 24mA
Balanced propagation delays:
– t
PLH
≅
t
PHL
Operating voltage range:
– V
CC
(Opr) = 2.0V to 3.6V
Pin and function compatible with
74 series 16244
Latch-up performance exceeds
500mA (JESD 17)
ESD performance:
– HBM > 2000V
(MIL STD 883 method 3015); MM > 200V
TSSOP48
Description
The 74LCX16244 is a low voltage CMOS 16 bit
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 inputs and
outputs.
Any nG output control governs four BUS
BUFFERS. Output Enable input (nG) tied together
gives full 16-bit operation.
When nG is LOW, the outputs are on. When nG is
HIGH, the output are in high impedance state.
This device is designed to be used with 3 state
memory address drivers, etc.
It has same speed performance at 3.3V than 5V
AC/ACT family, combined with a lower power
consumption.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
Order codes
Part number
74LCX16244TTR
Package
TSSOP48
Packaging
Tape and reel
February 2007
Rev 6
1/15
www.st.com
15
Contents
74LCX16244
Contents
1
2
Logic symbols and I/O equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
2.2
Pin connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3
Logic states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1
Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
4.1
Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
6
7
8
9
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2/15
单片机
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