Octal Buffer/Line Driver With 3-State Outputs - Samsung HT-DL200 Service Manual

3. 74VHCT244A
74VHCT244A

Octal Buffer/Line Driver with 3-STATE Outputs

General Description
The VHCT244A is an advanced high speed CMOS octal
bus transceiver fabricated with silicon gate CMOS technol-
ogy. It achieves high speed operation similar to equivalent
Bipolar Schottky TTL while maintaining the CMOS low
power dissipation. The VHCT244A is a non-inverting 3-
STATE buffer having two active-LOW output enables. This
device is designed to be used as 3-STATE memory
address drivers, clock drivers, and bus oriented transmitter/
receivers.
Protection circuits ensure that 0V to 7V can be applied to
the input and output (Note 1) pins without regard to the
supply voltage. These circuits prevent device destruction
Ordering Code:
Order Number
74VHCT244AM
74VHCT244ASJ
74VHCT244AMTC
74VHCT244AN
Surface mount packages are also available on Tape and Reel. Specify by appending the suffix letter ìXî to the ordering code.
Logic Symbol
Pin Descriptions
Samsung Electronics
Package Number
M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
MTC20 20-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 4.4mm Wide
N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Pin Names
OE , OE
1 2
I ñI
0 7
O ñO
0 7
due to mismatched supply and input/output voltages. This
device can be used to interface 5V to 3V systems and two
supply systems such as battery back up.
Note 1: Outputs in OFF-State
Features
= 5.9 ns (typ) at V
High Speed: t
PD
Power down protection is provided on inputs and
outputs
Low power dissipation: I
Pin and function compatible with 74HCT244
Package Description
Connection Diagram
Description
3-STATE Output Enable Inputs
Inputs
3-STATE Outputs
= 5V
CC
= 4 µA (max) @ T = 25°C
CC A
8-3