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HD74LS257
Quadruple 2-line-to-1-line Data Selectors / Multiplexers (with not inverted 3-state outputs)
REJ03D0469-0300 Rev.3.00 Jul.15.2005 This multiplexer features three-state outputs that can interface directly with and drive data lines of bus-organized systems. With all but one of the common outputs disabled (at a high-impedance state) the low impedance of the single enabled output will drive the bus line to a high or low logic level. To minimize the possibility that two outputs will attempt to take a common bus to opposite logic levels, the outputenable circuitry is designed such that the output disable times are shorter than the output enable times.
Features
* Ordering Information
Part Name HD74LS257P HD74LS257FPEL Package Type DILP-16 pin SOP-16 pin (JEITA) Package Code (Previous Code) PRDP0016AE-B (DP-16FV) Package Abbreviation P Taping Abbreviation (Quantity) -- EL (2,000 pcs/reel)
PRSP0016DH-B FP (FP-16DAV) Note: Please consult the sales office for the above package availability.
Pin Arrangement
Select 1A 1B 1Y 2A 2B 2Y GND
1 S 2 3 4 5 6 7 8 1A 1B 1Y 2A 2B 2Y 3Y OC 4A 4B 4Y 3A 3B
16 15 14 13 12 11 10 9
VCC Output Control 4A 4B 4Y 3A 3B 3Y
(Top view)
Rev.3.00, Jul.15.2005, page 1 of 5
HD74LS257
Function Table
Inputs OC H L L L L S X L L H H A X L H X X B X X X L H Output Z L H L H
Note: H; high level, L; low level, X; irrelevant, Z; off (high-impedance) state of a 3-state output
Block Diagram
Output Control 1A 1B 2A 2B 3A 3B 4A 4B 4Y 3Y 2Y 1Y
S
Absolute Maximum Ratings
Item Supply voltage Input voltage Output voltage (off-state) Operating temperature Power dissipation Storage temperature Symbol VCC VIN VO (off) Topr PT Tstg Ratings 7 7 5.5 -20 to +75 400 -65 to +150 Unit V V V C mW C
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item Supply voltage Output current Operating temperature Symbol VCC IOH IOL Topr Min 4.75 -- -- -20 Typ 5.00 -- -- 25 Max 5.25 -2.6 8 75 Unit V mA mA C
Rev.3.00, Jul.15.2005, page 2 of 5
HD74LS257
Electrical Characteristics
(Ta = -20 to +75 C)
Item Input voltage Symbol VIH VIL VOH Output voltage VOL S S except S S except S S except Output current IIH IIL II IOZ min. 2.0 -- 2.4 -- -- -- -- -- -- -- -- -- -- typ.* -- -- -- -- -- -- -- -- -- -- -- -- -- max. -- 0.8 -- 0.5 0.4 40 20 -0.8 -0.4 0.2 0.1 20 -20 Unit V V V V A mA mA A Condition
VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V, IOH = -2.6 mA IOL = 8 mA VCC = 4.75 V, VIH = 2 V, IOL = 4 mA VIL = 0.8 V VCC = 5.25 V, VI = 2.7 V VCC = 5.25 V, VI = 0.4 V VCC = 5.25 V, VI = 7 V VO = 2.4 V VO = 0.4 V VCC = 5.25 V, VIH = 2 V
Input current
Short-circuit output current IOS -30 -- -130 mA VCC = 5.25 V All outputs high -- 5.9 10 Supply ICC mA VCC = 5.25 V All outputs low -- 9.2 16 current** All outputs off -- 10 19 Input clamp voltage VIK -- -- -1.5 V VCC = 4.75 V, IIN = -18 mA Notes: * VCC = 5 V, Ta = 25C ** ICC is measured with all outputs open and all possible inputs grounded while achieving the stated output conditions.
Switching Characteristics
(VCC = 5 V, Ta = 25C)
Item Symbol tPLH tPHL tPLH tPHL tZH tZL tHZ tLZ Inputs A, B S OC OC Output Y Y Y Y min. -- -- -- -- -- -- -- -- typ. 12 12 14 14 20 20 18 16 max. 18 18 21 21 30 30 30 25 Unit ns ns ns ns CL = 5 pF, RL = 2 k CL = 15 pF, RL = 2 k Condition
Propagation delay time
Output enable time Output disable time
Rev.3.00, Jul.15.2005, page 3 of 5
HD74LS257
Testing Method
Test Circuit
VCC 4.5V RL
See Function Table
Input P.G. Zout = 50
OC S A B Y
Output
S1
5k CL
S2
Notes:
1. CL includes probe and jig capacitance. 2. All diodes are 1S2074(H).
Waveform
tTHL Output Control 90% 1.3V 3V 10% tZL 4.5V Waveform 1
S1 closed, S2 open
tTLH 90% 1.3V 3V 0V tLZ
S1 and, S2 closed
0V
10%
1.3V VOL tHZ VOH 0.5V
1.5V VOL VOH 1.5V
tZH Waveform 2
S1 open, S2 closed
1.3V 0V
0.5V
S1 and, S2 closed
Notes:
1. Input pulse; tTLH 15 ns, tTHL 6 ns, PRR = 1 MHz, duty cycle = 50% 2. Waveform 1 is for an output with internal conditions such that the output is low except when disabled by the output control. 3. Waveform 2 is for an output with internal conditions such that the output is high except when disabled by the output control.
Rev.3.00, Jul.15.2005, page 4 of 5
HD74LS257
Package Dimensions
JEITA Package Code P-DIP16-6.3x19.2-2.54 RENESAS Code PRDP0016AE-B Previous Code DP-16FV MASS[Typ.] 1.05g
D
16
9
1 0.89 b3
8
Z
E
A1
A
Reference Symbol
Dimension in Millimeters Min Nom 7.62 19.2 6.3 20.32 7.4 5.06 0.51 0.40 0.48 1.30 0.19 0 2.29 2.54 0.25 0.31 15 2.79 1.12 2.54 0.56 Max
e D E
L
1
A A1
e
bp
e1
b c b c
p 3
e Z ( Ni/Pd/Au plating ) L
JEITA Package Code P-SOP16-5.5x10.06-1.27
RENESAS Code PRSP0016DH-B
Previous Code FP-16DAV
MASS[Typ.] 0.24g
*1
D F 9
16
NOTE) 1. DIMENSIONS"*1 (Nom)"AND"*2" DO NOT INCLUDE MOLD FLASH. 2. DIMENSION"*3"DOES NOT INCLUDE TRIM OFFSET.
bp
HE
E
Index mark
Reference Symbol
*2
c
Dimension in Millimeters Min Nom 10.06 5.50 Max 10.5
Terminal cross section ( Ni/Pd/Au plating )
1 Z e
*3
D E A2
8 bp x M L1
A1 A bp b1 c
0.00
0.10
0.20 2.20
0.34
0.40
0.46
0.15
1
0.20
0.25
A
c
HE
0 7.50 7.80 1.27
8 8.00
A1
y L
e x y
0.12 0.15 0.80 0.50
1
Detail F
Z L L 0.70 1.15
0.90
Rev.3.00, Jul.15.2005, page 5 of 5
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