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74FCT162H501CTPACT Arkusz danych(PDF) 1 Page - Texas Instruments

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Numer części 74FCT162H501CTPACT
Szczegółowy opis  18-Bit Registered Transceivers
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Strona internetowa  http://www.ti.com
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18-Bit Registered Transceivers
CY74FCT16501T
CY74FCT162501T
CY74FCT162H501T
SCCS057B - August 1994 - Revised September 2001
Data sheet acquired from Cypress Semiconductor Corporation.
Data sheet modified to remove devices not offered.
Copyright
© 2001, Texas Instruments Incorporated
1CY74FCT162H501
T
Features
•Ioff supports partial-power-down 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%
CY74FCT16501T Features:
• 64 mA sink current, 32 mA source current
• Typical VOLP (ground bounce) <1.0V at VCC = 5V,
TA = 25˚C
CY74FCT162501T Features:
• Balanced 24 mA output drivers
• Reduced system switching noise
• Typical VOLP (ground bounce) <0.6V at VCC = 5V,
TA= 25˚C
CY74FCT162H501T Features:
• Bus hold retains last active state
• Eliminates the need for external pull-up or pull-down
resistors
Functional Description
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). 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
LOW-to-HIGH 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.
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.
The
CY74FCT16501T
is
ideally
suited
for
driving
high-capacitance loads and low-impedance backplanes.
THE CY74FCT162501T 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
CY74FCT162501T is ideal for driving transmission lines.
The CY74FCT162H501T is a 24-mA balanced output part, that
has “bus hold” on the data inputs. The device retains the input’s
last state whenever the input goes to high impedance. This
eliminates the need for pull-up/down resistors and prevents
floating inputs.
GND
Functional Block Diagram
Pin Configuration
1
2
3
4
5
6
7
8
9
10
11
12
OEAB
SSOP/TSSOP
Top View
13
14
15
16
17
18
19
20
21
22
23
24
LEAB
A 1
GND
GND
VCC
GND
GND
FCT16501-1
A 2
A 3
A 4
A 5
A 6
A 7
A 8
A 9
GND
25
26
27
28
GND
A 10
A 11
A 12
VCC
A 13
A 14
A 15
A 16
A 17
A 18
OEBA
LEBA
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
GND
CLKAB
B1
GND
B2
B3
VCC
B4
B5
B6
GND
B7
B8
B9
B10
B11
B12
B13
B14
B15
VCC
B16
B17
B18
CLKBA
OEAB
CLKBA
LEBA
OEBA
CLKAB
LEAB
C
D
C
D
C
D
A 1
B1
C
D
TO 17 OTHER CHANNELS
FCT16501-2


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