Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
18-Bit Registered Transceivers
SCCS056A - August 1994 - Revised October 2001
Features
•
•
•
•
•
•
•
•
CY74FCT16500T
CY74FCT162500T
Functional Description
FCT-C speed at 4.6 ns
Ioff supports partial-power- mode operation
Edge-rate control circuitry for significantly improved
noise characteristics
Typical output skew < 250 ps
ESD > 2000V
TSSOP (19.6-mil pitch) and SSOP (25-mil pitch)
packages
Industrial temperature range of −40˚C to +85˚C
VCC = 5V ± 10%
These 18-bit universal bus transceivers can be operated in
transparent, latched, or clock modes by combining D-type
latches and D-type flip-flops. Data flow in each direction is
controlled by output-enable (OEAB and OEBA), latch enable
(LEAB and LEBA), and clock inputs (CLKAB and CLKBA)
inputs. For A-to-B data flow, the device operates in transparent
mode when LEAB is HIGH. When LEAB is LOW, the A data is
latched if CLKAB is held at a HIGH or LOW logic level. If LEAB
is LOW, the A bus data is stored in the latch/flip-flop on the
HIGH-to-LOW transition of CLKAB. OEAB performs the output
enable function on the B port. Data flow from B-to-A is similar
to that of A-to-B and is controlled by OEBA, LEBA, and
CLKBA.
CY74FCT16500T Features:
• 64 mA sink current, 32 mA source current
• Typical VOLP (ground bounce) <1.0V at VCC = 5V,
TA = 25˚C
This device is fully specified for partial-power-down
applications using Ioff. The Ioff circuitry disables the outputs,
preventing damaging current backflow through the device
when it is powered down.
CY74FCT162500T Features:
• Balanced 24 mA output drivers
• Reduced system switching noise
• Typical VOLP (ground bounce) <0.6V at VCC = 5V,
TA= 25˚C
The CY74FCT16500T is ideally suited for driving
high-capacitance loads and low-impedance backplanes.
The CY74FCT162500T has 24-mA balanced output drivers
with current limiting resistors in the outputs. This reduces the
need for external terminating resistors and provides for
minimal undershoot and reduced ground bounce. The
CY74FCT162500T is ideal for driving transmission lines.
SSOP/TSSOP
Top View
Logic Block Diagram
OEAB
LEAB
1
56
2
55
GND
CLKAB
A1
3
54
B1
GND
4
53
GND
A2
5
52
B2
A3
6
51
B3
VCC
7
50
VCC
A4
49
B4
OEBA
8
A5
9
48
B5
CLKAB
A6
10
47
B6
GND
11
46
GND
A7
12
13
45
B7
44
B8
A9
A 10
14
43
B9
15
42
B10
A 11
16
41
B11
A 12
17
40
B12
GND
18
39
38
GND
B13
OEAB
CLKBA
LEBA
LEAB
C
A8
C
B1
A1
D
D
C
C
A 13
19
D
D
A 14
20
37
B14
A 15
21
36
B15
VCC
22
35
VCC
A 16
A 17
23
34
B16
24
25
33
B17
32
GND
26
31
B18
27
30
CLKBA
28
29
GND
TO 17 OTHER CHANNELS
FCT16500-1
GND
A 18
OEBA
LEBA
FCT16500-2
Copyright
© 2001, Texas Instruments Incorporated