21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
21098765432121098765432109876543210987654321210987654321098765432109876543212109876543210987654321098765432121098765432109876543210987654321
PI74FCT16500/162500T
18-BIT REGISTERED TRANSCEIVERS
PI74FCT16500T
PI74FCT162500T
Fast CMOS 18-Bit
Registered Transceivers
Product Description:
Product Features:
Common Features:5
聲 PI74FCT16500T and PI74FCT162500T are high-speed,
low power devices with high current drive.
聲 V
CC
= 5V 鹵10%
聲 Hysteresis on all inputs
聲 Packages available:
聳 56-pin 240 mil wide plastic TSSOP (A)
聳 56-pin 300 mil wide plastic SSOP (V)
PI74FCT16500T Features:
聲 High output drive: I
OH
= 聳32 mA; I
OL
= 64 mA
聲 Power off disable outputs permit 聯(lián)live insertion聰
聲 Typical V
OLP
(Output Ground Bounce) < 1.0V
at V
CC
= 5V, T
A
= 25擄C
PI74FCT162500T Features:
聲 Balanced output drivers: 鹵24 mA
聲 Reduced system switching noise
聲 Typical V
OLP
(Output Ground Bounce) < 0.6V
at V
CC
= 5V, T
A
= 25擄C
Pericom Semiconductor聮s PI74FCT series of logic circuits are pro-
duced in the Company聮s advanced 0.8 micron CMOS technology,
achieving industry leading speed grades.
The PI74FCT16500T and PI74FCT162500T are 18-bit registered bus
transceivers designed with D-type latches and flip-flops to allow
data flow in transparent, latched, and clocked modes. The Output
Enable (OEAB and OEBA), Latch Enable (LEAB and LEBA) and
Clock (CLKAB and CLKBA) inputs control the data flow in each
direction. When LEAB is HIGH, the device operates in transparent
mode for A-to-B data flow. When LEAB is LOW, the A data is latched
if CLKAB is held at a HIGH or LOW logic level. The A bus data is
stored in the latch/flip-flop on the HIGH-to-LOW transition of
CLKAB, if LEAB is LOW. OEAB performs the output enable
function on the B port. Data flow from B port to A port is similar using
OEBA, LEBA and CLKBA. These high-speed, low power devices
offer a flow-through organization for ease of board layout.
The PI74FCT16500T output buffers are designed with a Power-Off
disable allowing 聯(lián)live insertion聰 of boards when used as backplane
drivers.
The PI74FCT162500T 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.
Logic Block Diagram
OEAB
CLKBA
LEBA
OEBA
CLKAB
LEAB
C
A
1
D
C
B
1
D
C
D
C
D
TO 17 OTHER CHANNELS
1
PS2077A 01/15/95
1
2
3
4
5
6
