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PDF 74HC148 Data sheet ( Hoja de datos )
| Número de pieza | 74HC148 | |
| Descripción | 8 TO 3 LINE PRIORITY ENCODER | |
| Fabricantes | STMicroelectronics | |
| Logotipo |  |
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M54HC148
M74HC148
8 TO 3 LINE PRIORITY ENCODER
. HIGH SPEED
tPD = 15 ns (TYP.) AT VCC = 5 V
. LOW POWER DISSIPATION
ICC = 4 µA (MAX.) AT TA = 25 °C
. HIGH NOISE IMMUNITY
VNIH = VNIL = 28 % VCC (MIN.)
. OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
IOH = IOL = 4 mA (MIN.)
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. WIDE OPERATING VOLTAGE RANGE
VCC (OPR) = 2 V TO 6 V
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS148
DESCRIPTION
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M 54HC 14 8F 1R
M 74H C1 48 M1 R
M 74HC 14 8B 1R
M 74H C1 48 C1 R
The M54/74HC148 is a high speed CMOS 8-TO-3
LINE PRIORITY ENCODER fabricated in silicon
gate C2MOS technology.
PIN CONNECTIONS (top view)
It has the same high speed performance for LSTTL
combined with true CMOS low power consumption.
The M54/74HC148 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. Data inputs are active at the
low logic level.
All inputs are equipped with protection circuits
against static discharge and transient excess volt-
age.
INPUT AND OUTPUT EQUIVALENT CIRCUIT
October 1992
NC =
No Internal
Connection
1/11
1 page  
M54/M74HC148
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6 ns)
Symbol
Parameter
Test Conditions
VCC
(V)
TA = 25 oC
54HC and 74HC
Min. Typ. Max.
Value
-40 to 85 oC
74HC
Min. Max.
-55 to 125 oC
54HC
Min. Max.
Unit
tTLH Output Transition 2.0
tTHL Time
4.5
30 75
8 15
95 110
19 22 ns
6.0 7 13 16 19
tPLH Propagation
2.0
tPHL Delay Time
4.5
(In - A0, A1, A2) 6.0
60 150 190 225
19 30 38 45 ns
16 26 32 38
tPLH Propagation
tPHL Delay Time
(In - EO, GS)
2.0
4.5
6.0
60 150 190 225
19 30 38 45 ns
16 26 32 38
tPLH Propagation
tPHL Delay Time
(EI - EO)
2.0
4.5
6.0
40 115 145 175
14 23 29 35 ns
12 20 25 30
tPLH Propagation
tPHL Delay Time
(EI - GS)
2.0
4.5
6.0
40 115 145 175
14 23 29 35 ns
12 20 25 30
tPLH Propagation
2.0
tPHL Delay Time
4.5
(EI - A0, A1, A2) 6.0
40 115 145 175
14 23 29 35 ns
12 20 25 30
CIN Input Capacitance
5 10 10 10 pF
CPD (*) Power Dissipation
Capacitance
60
pF
(*) 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 operting current can be obtained by the following equation. ICC(opr) = CPD •VCC •fIN + ICC
SWITCHING CHARACTERISTICS TEST
CIRCUIT
TEST CIRCUIT ICC (Opr.)
INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF
SWITCHING CHARACTERISTICS TEST.
5/11
5 Page 
M54/M74HC148
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned
in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use ascritical components in life support devices or systems without express
written approval of SGS-THOMSON Microelectonics.
© 1994 SGS-THOMSON Microelectronics - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
Australia - Brazil - France - Germany - Hong Kong - Italy - Japan - Korea - Malaysia - Malta - Morocco - The Netherlands -
Singapore - Spain - Sweden - Switzerland - Taiwan - Thailand - United Kingdom - U.S.A
11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet 74HC148.PDF ] | |
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