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74ACT257
QUAD 2 CHANNEL MULTIPLEXER (3-STATE)
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HIGH SPEED: tPD = 5 ns (TYP.) at VCC = 5V LOW POWER DISSIPATION: ICC = 4 A(MAX.) at TA=25C COMPATIBLE WITH TTL OUTPUTS VIH = 2V (MIN.), V IL = 0.8V (MAX.) 50 TRANSMISSION LINE DRIVING CAPABILITY SYMMETRICAL OUTPUT IMPEDANCE: |IOH| = IOL = 24mA (MIN) BALANCED PROPAGATION DELAYS: tPLH tPHL OPERATING VOLTAGE RANGE: VCC (OPR) = 4.5V to 5.5V PIN AND FUNCTION COMPATIBLE WITH 74 SERIES 257 IMPROVED LATCH-UP IMMUNITY
DIP
SOP
TSSOP
ORDER CODES
PACKAGE DIP SOP TSSOP TUBE 74ACT257B 74ACT257M T&R 74ACT257MTR 74ACT257TTR
DESCRIPTION The 74ACT257 is an advanced high-speed CMOS QUAD 2-CHANNEL MULTIPLEXER (3-STATE) fabricated with sub-micron silicon gate and double-layer metal wiring C2MOS tecnology. It is composed of an independent 2-channel multiplexer with common SELECT and ENABLE (OE)inputs. It is a non-inverting multiplexer. When the ENABLE input is held HIGH, the outputs are forced to a high impedance state. When the
SELECT input is held LOW, "A" data is selected; when SELECT input is held HIGH, "B" data is selected. The device is designed to interface directly High Speed CMOS systems with TTL, NMOS and CMOS output voltage levels. All inputs and outputs are equipped with protection circuits against static discharge, giving them 2KV ESD immunity and transient excess voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
April 2001
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74ACT257
INPUT AND OUTPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No 1 2, 5, 11, 14 3, 6, 10, 13 4, 7, 9, 12 15 8 16 SYMBOL SELECT 1A to 4A 1B to 4B 1Y to 4Y OE GND VCC NAME AND FUNCTION Common Data Select Inputs Data Inputs From Source A Data Inputs From Source B Multiplexer Outputs 3 State Output Enable Inputs (Active LOW) Ground (0V) Positive Supply Voltage
TRUTH TABLE
INPUTS OE H L L L L
X : Don't Care Z : High Impedance
OUTPUT A X L H X X B X X X L H Y Z L H L H
SELECT X L L H H
LOGIC DIAGRAM
This logic diagram has not be used to estimate propagation delays
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74ACT257
ABSOLUTE MAXIMUM RATINGS
Symbol VCC VI VO IIK IOK IO Tstg TL Supply Voltage DC Input Voltage DC Output Voltage DC Input Diode Current DC Output Diode Current DC Output Current Storage Temperature Lead Temperature (10 sec) Parameter Value -0.5 to +7 -0.5 to VCC + 0.5 -0.5 to VCC + 0.5 20 20 50 200 -65 to +150 300 Unit V V V mA mA mA mA C C
ICC or IGND DC VCC or Ground Current
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied.
RECOMMENDED OPERATING CONDITIONS
Symbol VCC VI VO Top dt/dv Supply Voltage Input Voltage Output Voltage Operating Temperature Input Rise and Fall Time VCC = 4.5 to 5.5V (note 1) Parameter Value 4.5 to 5.5 0 to VCC 0 to VCC -55 to 125 8 Unit V V V C ns/V
1) VIN from 0.8V to 2.0V
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74ACT257
DC SPECIFICATIONS
Test Condition Symbol Parameter VCC (V) 4.5 5.5 4.5 5.5 4.5 5.5 4.5 5.5 VOL Low Level Output Voltage 4.5 5.5 4.5 5.5 II IOZ Input Leakage Current High Impedance Output Leakege Current Max ICC/Input Quiescent Supply Current Dynamic Output Current (note 1, 2) 5.5 5.5 5.5 5.5 5.5 VO = 0.1 V or VCC-0.1V VO = 0.1 V or VCC-0.1V IO=-50 A IO=-50 A IO=-24 mA IO=-24 mA IO=50 A IO=50 A IO=24 mA IO=24 mA VI = VCC or GND VI = VIH or VIL VO = VCC or GND VI = VCC - 2.1V VI = VCC or GND VOLD = 1.65 V max VOHD = 3.85 V min 0.6 4 4.4 5.4 3.86 4.86 0.001 0.001 0.1 0.1 0.36 0.36 0.1 0.5 TA = 25C Min. 2.0 2.0 Typ. 1.5 1.5 1.5 1.5 4.49 5.49 0.8 0.8 4.4 5.4 3.76 4.76 0.1 0.1 0.44 0.44 1 5 1.5 40 75 -75 Max. Value -40 to 85C Min. 2.0 2.0 0.8 0.8 4.4 5.4 3.7 4.7 0.1 0.1 0.5 0.5 1 5 1.6 80 50 -50 A mA mA A mA mA V Max. -55 to 125C Min. 2.0 2.0 0.8 0.8 V Max. V Unit
VIH VIL VOH
High Level Input Voltage Low Level Input Voltage High Level Output Voltage
ICCT ICC IOLD IOHD
1) Maximum test duration 2ms, one output loaded at time 2) Incident wave switching is guaranteed on trasmission lines with impedances as low as 50
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 , Input tr = tf = 3ns)
Test Condition Symbol Parameter VCC (V) 5.0(*) 5.0(*) 5.0(*) 5.0(*) TA = 25C Min. Typ. 5.0 6.0 5.0 6.0 Max. 8.0 9.0 8.0 9.0 Value -40 to 85C Min. Max. 9.0 10.0 9.0 10.0 -55 to 125C Min. Max. 9.0 10.0 9.0 10.0 ns ns ns ns Unit
tPLH tPHL Propagation Delay Time A, B to Y tPLH tPHL Propagation Delay Time SELECT to Y tPZL tPZH Output Enable Time tPLZ tPHZ Output Disable Time
(*) Voltage range is 5.0V 0.5V
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74ACT257
CAPACITIVE CHARACTERISTICS
Test Condition Symbol Parameter VCC (V) 5.0 5.0 5.0 fIN = 10MHz TA = 25C Min. Typ. 5 8 25 Max. Value -40 to 85C Min. Max. -55 to 125C Min. Max. pF pF pF Unit
CIN COUT CPD
Input Capacitance Output Capacitance Power Dissipation Capacitance (note 1)
1) CPD is defined as the value of the IC's internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. ICC(opr) = CPD x VCC x fIN + ICC/n (per circuit)
TEST CIRCUIT
TEST tPLH, tPHL
SWITCH
Open 2VCC Open
tPZL, tPLZ tPZH, tPHZ
CL = 50pF or equivalent (includes jig and probe capacitance) RL = R1 = 500 or equivalent RT = ZOUT of pulse generator (typically 50)
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74ACT257
WAVEFORM 1: PROPAGATION DELAYS FOR INVERTING CONDITIONS (f=1MHz; 50% duty cycle)
WAVEFORM 2: PROPAGATION DELAYS FOR NON-INVERTING CONDITIONS (f=1MHz; 50% duty cycle)
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WAVEFORM 3: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
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Plastic DIP-16 (0.25) MECHANICAL DATA
mm MIN. a1 B b b1 D E e e3 F I L Z 3.3 1.27 8.5 2.54 17.78 7.1 5.1 0.130 0.050 0.51 0.77 0.5 0.25 20 0.335 0.100 0.700 0.280 0.201 1.65 TYP. MAX. MIN. 0.020 0.030 0.020 0.010 0.787 0.065 inch TYP. MAX.
DIM.
P001C
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74ACT257
SO-16 MECHANICAL DATA
DIM. MIN. A a1 a2 b b1 C c1 D E e e3 F G L M S 3.8 4.6 0.5 9.8 5.8 1.27 8.89 4.0 5.3 1.27 0.62 8 (max.) 0.149 0.181 0.019 10 6.2 0.35 0.19 0.5 45 (typ.) 0.385 0.228 0.050 0.350 0.157 0.208 0.050 0.024 0.393 0.244 0.1 mm TYP. MAX. 1.75 0.2 1.65 0.46 0.25 0.013 0.007 0.019 0.004 MIN. inch TYP. MAX. 0.068 0.007 0.064 0.018 0.010
P013H
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74ACT257
TSSOP16 MECHANICAL DATA
mm MIN. A A1 A2 b c D E E1 e K L 0o 0.50 0.05 0.85 0.19 0.09 4.9 6.25 4.3 5 6.4 4.4 0.65 BSC 4o 0.60 8o 0.70 0o 0.020 0.10 0.9 TYP. MAX. 1.1 0.15 0.95 0.30 0.20 5.1 6.5 4.48 0.002 0.335 0.0075 0.0035 0.193 0.246 0.169 0.197 0.252 0.173 0.0256 BSC 4o 0.024 8o 0.028 0.004 0.354 MIN. inch TYP. MAX. 0.433 0.006 0.374 0.0118 0.0079 0.201 0.256 0.176
DIM.
A
A2 A1 b e K c L E
D
E1
PIN 1 IDENTIFICATION
1
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74ACT257
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. (c) The ST logo is a registered trademark of STMicroelectronics (c) 2001 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - China - Finland - France - Germany - Hong Kong - India - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom (c) http://www.st.com
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