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CY74FCT138ATPC Datasheet

  • CY74FCT138ATPC

  • 1-of-8 Decoder

  • 6頁(yè)

  • CYPRESS

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1CY 54/7 4FCT138 T
fax id: 7013
CY54/74FCT138T
1-of-8 Decoder
Features
鈥?/div>
Function, pinout, and drive compatible with FCT and
F logic
鈥?/div>
FCT-C speed at 5.0 ns max. (Com鈥檒),
FCT-A speed at 5.8 ns max. (Com鈥檒)
鈥?/div>
Reduced V
OH
(typically = 3.3V) versions of equivalent
FCT functions
鈥?/div>
Edge-rate control circuitry for significantly improved
noise characteristics
鈥?/div>
Power-off disable feature
鈥?/div>
ESD > 2000V
鈥?/div>
Matched rise and fall times
鈥?/div>
Fully compatible with TTL input and output logic levels
鈥?/div>
Extended commercial range of
鈭?0擄C
to +85擄C
鈥?Sink current
64 mA (Com鈥檒),
32 mA (Mil)
32 mA (Com鈥檒),
12 mA (Mil)
鈥?/div>
Dual 1-of-8 decoder with enables
Source current
Functional Description
The FCT138T is a 1-of-8 decoder. The FCT138T accepts
three binary weighted inputs (A
0
, A
1
, A
2
) and, when enabled,
provides eight mutually exclusive active LOW outputs
(O
0
鈥揙
7
). The FCT138T features three enable inputs, two
active LOW (E
1
, E
2
) and one active HIGH (E
3
).
All inputs will be HIGH unless E
1
and E
2
are LOW and E
3
is
HIGH. This multiple enable function allows easy parallel
expansion of the device to a 1-of-32 (5 lines to 32 lines)
decoder with just four FCT138T devices and one inverter.
The outputs are designed with a power-off disable feature to
allow for live insertion of boards.
Logic Block Diagram
E
1
E
2
E
3
A
2
A
1
A
0
Pin Configurations
LCC
Top View
E2
NC
E1
A2
E3
A
0
3
2
1
20
19
14 15 16 17 18
O4
O3
NC
O2
O1
A
1
A
0
NC
V
CC
O
0
A
1
A
2
E
1
E
2
E
3
O
7
GND
DIP/SOIC/QSOP
Top View
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
O
0
O
1
O
2
O
3
O
4
O
5
O
6
8
O
7
GND
NC
O
6
O
5
9
10
11
12
13
7 6 5 4
FCT138T鈥?
O
7
O
6
O
5
O
4
O
3
O
2
O
1
O
0
FCT138T鈥?
FCT138T鈥?
Pin Description
Name
A
E
1
鈭扙
2
E
3
O
Address Inputs
Enable Inputs (Active LOW)
Enable Input (Active HIGH)
Outputs
Description
Cypress Semiconductor Corporation
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?CA 95134 鈥?/div>
408-943-2600
May 1994 鈥?Revised March 17, 1997

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