CY5474FCT138T Datasheet, PDF (1/7 Pages) Texas Instruments – 1-of-8 Decoder

CY54FCT138T, CY74FCT138T
1-OF-8 DECODERS
D Function, Pinout, and Drive Compatible
With FCT and F Logic
D Reduced V_OH (Typically = 3.3 V) Versions of
Equivalent FCT Functions
D Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics
D I_off Supports Partial-Power-Down Mode
Operation
D Matched Rise and Fall Times
D Fully Compatible With TTL Input and
Output Logic Levels
D Dual 1-of-8 Decoder With Enables
D ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
D CY54FCT138T
– 32-mA Output Sink Current
– 12-mA Output Source Current
D CY74FCT138T
– 64-mA Output Sink Current
– 32-mA Output Source Current
SCCS013B – MAY 1994 – REVISED OCTOBER 2001
CY54FCT138T . . . D PACKAGE
CY74FCT138T . . . Q OR SO PACKAGE
(TOP VIEW)
A_{0 1}
A_{1 2}
A_{2 3}
E_{1 4}
E₂ 5
E₃ 6
O₇ 7
GND 8
16 ^VCC
15 ^O0
14 ^O1
13 ^O₂
12 O₃
11 O₄
10 O₅
9 O₆
CY54FCT138T . . . L PACKAGE
(TOP VIEW)
3 2 1 20 19
A_{2 4}
18 ^O1
E₁ 5
17 O₂
NC 6
16 NC
E₂ 7
15 O₃
E₃ 8
14 O₄
9 10 11 12 13
description
NC – No internal connection
The ’FCT138T devices are 1-of-8 decoders. These devices accept three binary weighted inputs (A₀, A₁, A₂)
and, when enabled, provide eight mutually exclusive active-low outputs (O₀–O₇). The ’FCT138T devices
feature three enable inputs: two active low (E₁, E₂) and one active high (E₃).
All outputs are high unless E₁ and E₂ are low and E₃ is high. This multiple-enable function allows easy parallel
expansion of the device to a 1-of-32 (five lines to 32 lines) decoder with just four ’FCT138T devices and one
inverter.
These devices are fully specified for partial-power-down applications using I_off. The I_off circuitry disables the
outputs, preventing damaging current backflow through the device when it is powered down.
PIN DESCRIPTION
NAME
DESCRIPTION
A Address inputs
E1, E2
E3
O
Enable inputs (active low)
Enable input (active high)
Outputs
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright  2001, Texas Instruments Incorporated
On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.
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