power devices with high current drive.
鈥?Power off disable outputs permit 鈥渓ive insertion鈥?/div>
鈥?Typical V
OLP
(Output Ground Bounce) < 1.0V
at V
CC
= 5V, T
A
= 25擄C
PI74FCT162823T Features:
鈥?Balanced output drivers: 鹵24 mA
鈥?Reduced system switching noise
鈥?Typical V
OLP
(Output Ground Bounce) < 0.6V
at V
CC
= 5V, T
A
= 25擄C
PI74FCT162H823T Features:
鈥?Bus Hold retains last active bus state during 3-state
鈥?Eliminates the need for external pull-up resistors
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PI74FCT16823T/162823/162H823T
PI74FCT16823T
18-BIT REGISTERS
PI74FCT162823T
PI74FCT162H823T
Fast CMOS
18-Bit Registers
Product Description:
Pericom Semiconductor鈥檚 PI74FCT series of logic circuits are pro-
duced in the Company鈥檚 advanced 0.6 micron CMOS technology,
achieving industry leading speed grades.
The PI74FCT16823T, PI74FCT162823T and PI74FCT162H823
are 18-bit wide registers with clock enable (xCLKEN) and clear
(xCLR) controls that make these devices especially suitable for
parity bus interfacing in high-performance systems. The devices
can be operated as two 9-bit registers or one 18-bit register using the
control inputs. Signal pins are arranged in a flow-through
organization for ease of layout and hysteresis is designed into all
inputs to improve noise margin.
The PI74FCT16823T output buffers are designed with a Power-
Off disable function allowing 鈥渓ive insertion鈥?of boards when the
devices are used as backplane drives.
The PI74FCT162823T has 鹵24 mA balanced output drivers. It is
designed with current limiting resistors at its outputs to control the
output edge rate resulting in lower ground bounce and undershoot.
This eliminates the need for external terminating resistors for most
interface applications.
The PI74FCT162H823T has 鈥淏us Hold鈥?which retains the input鈥檚
last state whenever the input goes to high-impedance preventing
鈥渇loating鈥?inputs and eliminating the need for pull-up/down resistors.
Logic Block Diagram
1
OE
1
CLR
1
CLK
1
CLKEN
2
OE
2
CLR
2
CLK
2
CLKEN
R
C
D
1
D
1
1
Q
1
R
C
D
2
D
1
2
Q
1
To 8 other channels
To 8 other channels
1
PS2040A 03/11/96
1
2
3
4
5
6
7
8
