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HD74LS148
8-line-to-3-line Octal Priority Encoder
REJ03D0437-0200 Rev.2.00 Feb.18.2005 The HD74LS148 encodes eight data lines to three-line (4-2-1) binary (octal). Cascading circuitry (enable input EI and enable output EO) has been provided to allow octal expansion without the need for external circuitry. The data inputs and outputs are active at the low logic level.
Features
* Ordering Information
Part Name HD74LS148P HD74LS148FPEL Package Type DILP-16 pin SOP-16 pin (JEITA) Package Code (Previous Code) PRDP0016AE-B (DP-16FV) PRSP0016DH-B (FP-16DAV) Package Abbreviation P FP Taping Abbreviation (Quantity) -- EL (2,000 pcs/reel)
Note: Please consult the sales office for the above package availability.
Pin Arrangement
4 5 Inputs 6 7 EI A2 Outputs A1 GND
1 4 2 3 4 5 6 7 8 5 6 7 EI A2 A1 A0 EO GS 3 2 1 0
16 15 14 13 12 11 10 9
VCC EO Outputs GS 3 2 Inputs 1 0 A0 Outputs
(Top view)
Rev.2.00, Feb.18.2005, page 1 of 5
HD74LS148
Function Table
EI H L L L L L L L L L 0 X H X X X X X X X L 1 X H X X X X X X L H 2 X H X X X X X L H H Inputs 3 X H X X X X L H H H 4 X H X X X L H H H H 5 X H X X L H H H H H 6 X H X L H H H H H H 7 X H L H H H H H H H A2 H H L L L L H H H H A1 H H L L H H L L H H Outputs A0 H H L H L H L H L H GS H H L L L L L L L L EO H L H H H H H H H H
H ; high level, L ; low level, X ; irrelevant
Block Diagram
0 EO
1
GS
2 A0 3
4 A1 5
6
7 EI
A2
Absolute Maximum Ratings
Item Supply voltage Input voltage Power dissipation Storage temperature Symbol VCC VIN PT Tstg Ratings 7 7 400 -65 to +150 Unit V V mW C
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Rev.2.00, Feb.18.2005, page 2 of 5
HD74LS148
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 -400 8 75 Unit V A mA C
Electrical Characteristics
(Ta = -20 to +75 C)
Item Input voltage Symbol VIH VIL VOH Output voltage VOL 1 to 7 Inputs Other inputs 1 to 7 Inputs Other inputs 1 to 7 Inputs Other inputs IIH IIL II IOS ICC min. 2.0 -- 2.7 -- -- -- -- -- -- -- -- -20 -- -- -- typ.* -- -- -- -- -- -- -- -- -- -- -- -- 12 10 -- max. -- 0.8 -- 0.4 0.5 40 20 -0.8 -0.4 0.2 0.1 -100 20 17 -1.5 Unit V V V V A mA mA mA mA mA V Condition
VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V, IOH = -400 A IOL = 4 mA VCC = 4.75 V, VIH = 2 V, IOL = 8 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 VCC = 5.25 V Condition 1 VCC = 5.25 V Condition 2 VCC = 4.75 V, IIN = -18 mA
Input current
Short-circuit output current Supply current**
Input clamp voltage VIK Notes: * VCC = 5 V, Ta = 25C ** The condition 1 is measured with inputs 7 and EI grounded, other inputs and outputs open, the condition 2 is measured with all inputs and outputs open.
Switching Characteristics
(VCC = 5 V, Ta = 25C)
Item Symbol tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL tPLH tPHL min. -- -- -- -- -- -- -- -- -- -- -- -- -- -- typ. 14 15 20 16 7 25 35 9 16 12 12 14 12 23 max. 18 25 36 29 18 40 55 21 25 25 17 36 21 35 Unit ns ns ns ns ns ns ns Inputs 0 to 7 0 to 7 0 to 7 0 to 7 EI EI EI Outputs A0, A1 or A2 A0, A1 or A2 EO GS A0, A1 or A2 GS EO Output Waveforms In-phase Output Out-of-phase Output Out-of-phase Output In-phase Output In-phase Output In-phase Output In-phase Output CL = 15 pF, RL = 2 k Condition
Propagation delay time
Rev.2.00, Feb.18.2005, page 3 of 5
HD74LS148
Testing Method
Test Circuit
VCC 4.5V RL EO EI Input 0 Output GS Output A0 Output A1 Output A2 Same as Load Circuit 1. Same as Load Circuit 1. Same as Load Circuit 1. Same as Load Circuit 1. CL Output
Load circuit 1
P.G. Zout = 50
See Testing Table
1 2 3 4 5 6 7
Notes:
1. CL includes probe and jig capacitance. 2. All diodes are 1S2074(H).
Waveform
tTLH 90% 1.3 V 10% tPLH tTHL 90% 1.3 V 10% tPHL VOH In phase output tPHL 1.3 V tPLH VOH Out of phase output 1.3 V 1.3 V VOL 1.3 V VOL 3V 0V
Input
Note:
Input pulse; tTLH 15 ns, tTHL 6 ns, PRR = 1 MHz, duty cycle 50%
Rev.2.00, Feb.18.2005, page 4 of 5
HD74LS148
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.2.00, Feb.18.2005, page 5 of 5
Sales Strategic Planning Div.
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