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PDF PI74FCT238T Data sheet ( Hoja de datos )
| Número de pieza | PI74FCT238T | |
| Descripción | Fast CMOS 1-of-8 Decoder | |
| Fabricantes | Pericom Semiconductor Corporation | |
| Logotipo |  |
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PI74FCT138/238T
PI74FCT138T12345678901234567890123456789012123456789012345678901234567890121234567890123456789012345678901212345678901234567819-0O123F45-6878D90E12C123O45D67E89R012
PI74FCT238T
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Fast CMOS 1-of-8 Decoder
Product Features:
• PI74FCT138/238T is pin compatible with bipolar FAST™
Series at a higher speed and lower power consumption
• TTL input and output levels
• Extremely low static power
• Hysteresis on all inputs
• Industrial operating temperature range: –40°C to +85°C
• Packages available:
– 16-pin 150 mil wide plastic QSOP (Q)
– 16-pin 300 mil wide plastic SOIC (S)
– 16-pin 150 mil wide plastic SOIC (W)
Product Description:
Pericom Semiconductor’s PI74FCT series of logic circuits are pro-
duced in the Company’s advanced 0.8 micron CMOS technology,
achieving industry leading speed grades.
These high-speed decoders accept three binary weighted inputs
(A0, A1, A2) and gives eight mutually exclusive active LOW
outputs (O0-O7: PI74FCT138T) or active HIGH outputs (O0-O7:
PI74FCT238T) when enabled. These devices contain three enable
inputs, two active LOW (E1, E2) and one active HIGH (E3). On the
PI74FCT138T all outputs will be HIGH and on the PI74FCT238T
all outputs will be LOW, except when E1 and E2 are LOW and E3
is HIGH.
Logic Block Diagram
A2 A1
A0
E1 E2 E3
O7 O6 O5 O4 O3 O2 O1 O0
PI74FCT138T function shown.
1 PS2004A 03/09/96
1 page  
PI74FCT138/238T
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Power Supply Characteristics
Parameters Description
ICC Quiescent Power
Supply Current
∆ICC Supply Current per
Input @ TTL HIGH
ICCD Supply Current per
Input per MHz(4)
IC Total Power Supply
Current(6)
Test Conditions(1)
VCC = Max.
VCC = Max.
VIN = GND
or VCC
VIN = 3.4V(3)
Min.
Typ(2) Max.
0.1 500
0.5 2.0
Units
µA
mA
VCC = Max., Outputs Open
One Input Toggling
50% Duty Cycle
VCC = Max., Outputs Open
fCP = 10 MHZ, 50% Duty Cycle
Toggle E1, E2, or E3
One Bit toggling
VIN = VCC
VIN = GND
VIN = VCC
VIN = GND
VIN = 3.4V
VIN = GND
0.15 0.3 mA/
MHz
1.5 4.0(5) mA
1.8 5.0(5)
Notes:
1. Fo Max. or Min. conditions, use appropriate value specified under Electrical Characteristics for the applicable device.
2. Typical values are at Vcc = 5.0V, +25°C ambient.
3. Per TTL driven input (VIN = 3.4V); all other inputs at Vcc or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the Icc formula. These limits are guaranteed but not tested.
6. IC =IQUIESCENT + IINPUTS + IDYNAMIC
IC = ICC + ∆ICC DHNT + ICCD (fCP/2 + fINI)
ICC = Quiescent Current
∆ICC = Power Supply Current for a TTL High Input (VIN = 3.4V)
DH = Duty Cycle for TTL Inputs High
NT = Number of TTL Inputs at DH
ICCD = Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
fCP = Clock Frequency for Register Devices (Zero for Non-Register Devices)
fo = Output Frequency
No = Number of Outputs at fo
All currents are in milliamps and all frequencies are in megahertz.
5 PS2004A 03/09/96
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet PI74FCT238T.PDF ] | |
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