Operating Range 5.5-V EPIC (Enhanced-Performance Implanted CMOS) Proce
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SN54AHC257, SN74AHC257 QUADRUPLE 2-LINE 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
Operating Range 5.5-V EPIC (Enhanced-Performance Implanted CMOS) Process Package Options Include Plastic Small-Outline (D), Shrink Small-Outline (DB), Thin Very Small-Outline (DGV), Thin Shrink Small-Outline (PW), Ceramic Flat Packages, Ceramic Chip Carriers (FK), Standard Plastic Ceramic DIPs
SN54AHC257 PACKAGE SN74AHC257 DGV, PACKAGE (TOP VIEW)
description
These quadruple 2-line 1-line data selectors/multiplexers designed 5.5-V operation. 'AHC257 devices designed multiplex signals from 4-bit data sources 4-output data lines bus-organized systems. 3-state outputs load data lines when output-enable (OE) input high logic level. ensure high-impedance state during power power down, should tied through pullup resistor; minimum value resistor determined current-sinking capability driver. SN54AHC257 characterized operation over full military temperature range -55°C 125°C. SN74AHC257 characterized operation from -40°C 85°C.
SN54AHC257 PACKAGE (TOP VIEW)
internal connection
FUNCTION TABLE INPUTS OUTPUT
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PRODUCT PREVIEW information concerns products formative design phase development. Characteristic data other specifications design goals. Texas Instruments reserves right change discontinue these products without notice.
Copyright 1998, Texas Instruments Incorporated
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SN54AHC257, SN74AHC257 QUADRUPLE 2-LINE 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
logic symbol
This symbol accordance with ANSI/IEEE 91-1984 Publication 617-12. numbers shown DGV, packages.
PRODUCT PREVIEW
logic diagram (positive logic)
numbers shown DGV, packages.
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SN54AHC257, SN74AHC257 QUADRUPLE 2-LINE 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
Supply voltage range, -0.5 Input voltage range, (see Note -0.5 Output voltage range, (see Note -0.5 Input clamp current, Output clamp current, VCC) Continuous output current, VCC) Continuous current through Package thermal impedance, (see Note package 113°C/W package 131°C/W package 180°C/W package 78°C/W package 149°C/W Storage temperature range, Tstg -65°C 150°C
Stresses beyond those listed under "absolute maximum ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated under "recommended operating conditions" implied. Exposure absolute-maximum-rated conditions extended periods affect device reliability. NOTES: input output voltage ratings exceeded input output current ratings observed. package thermal impedance calculated accordance with JESD except through-hole packages, which trace length zero.
recommended operating conditions (see Note
SN54AHC257 Supply voltage High-level input voltage Low-level input voltage Input voltage Output voltage High-level output current Low-level output current 3.85 1.65 SN74AHC257 3.85 1.65 UNIT
ns/V
Input transition rise fall rate
Operating free-air temperature NOTE unused inputs device must held ensure proper device operation. Refer application report, Implications Slow Floating CMOS Inputs, literature number SCBA004.
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SN54AHC257, SN74AHC257 QUADRUPLE 2-LINE 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
electrical characteristics over recommended operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS GND, 2.58 3.94 0.36 0.36 ±0.1 ±0.25 25°C SN54AHC257 2.48 ±2.5 SN74AHC257 2.48 0.44 0.44 ±2.5 UNIT
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SN54AHC257, SN74AHC257 QUADRUPLE 2-LINE 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
switching characteristics over recommended operating free-air temperature range, (unless otherwise noted) (see Figure
SN54AHC257 PARAMETER tPLH* tPHL* tPLH* tPHL* tPZH* tPZL* tPHZ* tPLZ* tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ FROM (INPUT) (OUTPUT) LOAD CAPACITANCE 25°C UNIT
products compliant MIL-PRF-38535, this parameter production tested.
switching characteristics over recommended operating free-air temperature range, (unless otherwise noted) (see Figure
SN74AHC257 PARAMETER tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ FROM (INPUT) (OUTPUT) LOAD CAPACITANCE 25°C UNIT
POST OFFICE 655303
DALLAS, TEXAS 75265
PRODUCT PREVIEW
SN54AHC257, SN74AHC257 QUADRUPLE 2-LINE 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
switching characteristics over recommended operating free-air temperature range, (unless otherwise noted) (see Figure
SN54AHC257 PARAMETER tPLH* tPHL* tPLH* tPHL* tPZH* tPZL* tPHZ* tPLZ* tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ FROM (INPUT) (OUTPUT) LOAD CAPACITANCE 25°C UNIT
PRODUCT PREVIEW
products compliant MIL-PRF-38535, this parameter production tested.
switching characteristics over recommended operating free-air temperature range, (unless otherwise noted) (see Figure
SN74AHC257 PARAMETER tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ tPLH tPHL tPLH tPHL tPZH tPZL tPHZ tPLZ FROM (INPUT) (OUTPUT) LOAD CAPACITANCE 25°C UNIT
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SN54AHC257, SN74AHC257 QUADRUPLE 2-LINE 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
noise characteristics 25°C (see Note
PARAMETER VOL(P) VOL(V) VOH(V) VIH(D) Quiet output, maximum dynamic Quiet output, minimum dynamic Quiet output, minimum dynamic High-level dynamic input voltage SN74AHC257 UNIT
VIL(D) Low-level dynamic input voltage NOTE Characteristics surface-mount packages only.
operating characteristics, 25°C
PARAMETER Power dissipation capacitance TEST CONDITIONS load, UNIT
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PRODUCT PREVIEW
SN54AHC257, SN74AHC257 QUADRUPLE 2-LINE 1-LINE DATA SELECTORS/MULTIPLEXERS WITH 3-STATE OUTPUTS
PARAMETER MEASUREMENT INFORMATION
Open
From Output Under Test (see Note
Test Point
From Output Under Test (see Note
TEST tPLH/tPHL tPLZ/tPZL tPHZ/tPZH Open Drain
Open
LOAD CIRCUIT TOTEM-POLE OUTPUTS
LOAD CIRCUIT 3-STATE OPEN-DRAIN OUTPUTS Timing Input Data Input VOLTAGE WAVEFORMS SETUP HOLD TIMES tPZL Output Waveform (see Note Output Waveform (see Note tPZH tPLZ tPHZ
Input
PRODUCT PREVIEW
VOLTAGE WAVEFORMS PULSE DURATION
Input tPLH In-Phase Output tPHL Out-of-Phase Output
tPHL
Output Control
tPLH
VOLTAGE WAVEFORMS PROPAGATION DELAY TIMES INVERTING NONINVERTING OUTPUTS
VOLTAGE WAVEFORMS ENABLE DISABLE TIMES LOW- HIGH-LEVEL ENABLING
NOTES: includes probe capacitance. Waveform output with internal conditions such that output except when disabled output control. Waveform output with internal conditions such that output high except when disabled output control. input pulses supplied generators having following characteristics: MHz, outputs measured time with input transition measurement.
Figure Load Circuit Voltage Waveforms
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Copyright 1998, Texas Instruments Incorporated
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