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PDF IDT74FCT138TQ Data sheet ( Hoja de datos )

Número de pieza IDT74FCT138TQ
Descripción FAST CMOS 1-OF-8 DECODER WITH ENABLE
Fabricantes Integrated Device Tech 
Logotipo Integrated Device Tech Logotipo



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Integrated Device Technology, Inc.
FAST CMOS
1-OF-8 DECODER
WITH ENABLE
IDT54/74FCT138T/AT/CT
FEATURES:
• Std., A and C speed grades
• Low input and output leakage 1µA (max.)
• CMOS power levels
• True TTL input and output compatibility
– VOH = 3.3V (typ.)
– VOL = 0.3V (typ.)
• High drive outputs (-15mA IOH, 48mA IOL)
• Meets or exceeds JEDEC standard 18 specifications
• Product available in Radiation Tolerant and Radiation
Enhanced versions
• Military product compliant to MIL-STD-883, Class B
and DESC listed (dual marked)
• Available in DIP, SOIC, QSOP, CERPACK and
LCC packages
DESCRIPTION:
The IDT54/74FCT138T/AT/CT are 1-of-8 decoders built
using an advanced dual metal CMOS technology. The IDT54/
74FCT138T/AT/CT accepts three binary weighted inputs (A0,
A1, A2) and, when enabled, provides eight mutually exclusive
active LOW outputs (O0-O7). The IDT54/74FCT138T/AT/CT
features three enable inputs, two active LOW (E1, E2) and one
active HIGH (E3). All outputs will be 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 (5 lines to
32 lines) decoder with just four IDT54/74FCT138T/AT/CT
devices and one inverter.
FUNCTIONAL BLOCK DIAGRAM
A2 A1
A0
E1 E2 E3
PIN CONFIGURATIONS
A0
A1
A2
E1
E2
E3
O7
GND
1 16
2
15
P16-1
3 D16-1 14
4 SO16-1 13
5 SO16-7 12
&
6 E16-1 11
7 10
89
VCC
O0
O1
O2
O3
O4
O5
O6
DIP/SOIC/QSOP/CERPACK
TOP VIEW
INDEX
2570 drw 02
O7 O6 O5 O4 O3 O2 O1 O0
2570 drw 01
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
MILITARY AND COMMERCIAL TEMPERATURE RANGES
©1995 Integrated Device Technology, Inc.
6.3
3 2 20 19
A2 4
1 18 O1
E1 5
17 O2
NC 6
L20-2
16 NC
E2 7
15 O3
E3 8
14 O4
9 10 11 12 13
2570 drw 03
LCC
TOP VIEW
APRIL 1995
DSC-4213/5
1

1 page




IDT74FCT138TQ pdf
IDT54/74FCT138T/AT/CT
FAST CMOS 1-OF-8 DECODER-WITH ENABLE
MILITARY AND COMMERCIAL TEMPERATURE RANGES
TEST CIRCUITS AND WAVEFORMS
TEST CIRCUITS FOR ALL OUTPUTS
V CC
VIN
Pulse
Generator
D.U.T.
RT
VOUT
50pF
CL
500
500
7.0V
SWITCH POSITION
Test
Switch
Open Drain
Disable Low
Closed
Enable Low
All Other Tests
Open
DEFINITIONS:
2570 tbl 08
CL= Load capacitance: includes jig and probe capacitance.
RT = Termination resistance: should be equal to ZOUT of the Pulse
Generator.
2570 drw 04
SET-UP, HOLD AND RELEASE TIMES
PULSE WIDTH
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS CONTROL
PRESET
CLEAR
ETC.
SYNCHRONOUS CONTROL
PRESET
CLEAR
CLOCK ENABLE
ETC.
tSU
tSU
tH
tREM
tH
PROPAGATION DELAY
SAME PHASE
INPUT TRANSITION
OUTPUT
OPPOSITE PHASE
INPUT TRANSITION
tPLH
tPLH
tPHL
tPHL
3V
1.5V
0V
3V
1.5V
0V
LOW-HIGH-LOW
PULSE
tW
1.5V
3V
1.5V
0V
HIGH-LOW-HIGH
PULSE
1.5V
3V
1.5V
0V
2570 drw 06
2570 drw 05
ENABLE AND DISABLE TIMES
3V
1.5V
0V
VOH
1.5V
VOL
3V
1.5V
0V
2570 drw 07
ENABLE
DISABLE
CONTROL
INPUT
OUTPUT
NORMALLY
LOW
tPZL
SWITCH
CLOSED
tPZH
OUTPUT
NORMALLY
HIGH
SWITCH
OPEN
3V
1.5V
0V
tPLZ
3.5V
3.5V
1.5V
tPHZ
0.3V VOL
1.5V
0.3V VOH
0V 0V
2570 drw 08
NOTES:
1. Diagram shown for input Control Enable-LOW and input Control Disable-
HIGH
2. Pulse Generator for All Pulses: Rate 1.0MHz; tF 2.5ns; tR 2.5ns
6.3 5

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