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PDF M54HCT688 Data sheet ( Hoja de datos )
| Número de pieza | M54HCT688 | |
| Descripción | 8 BIT EQUALITY COMPARATOR | |
| Fabricantes | ST Microelectronics | |
| Logotipo |  |
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M54HCT688
M74HCT688
. HIGH SPEED
tPD = 17 ns (TYP.) AT VCC = 5 V
. LOW POWER DISSIPATION
ICC = 4 µA (MAX.) AT TA = 25 °C
. COMPATIBLE WITH TTL OUTPUTS
VIH = 2V (MIN.) VIL = 0.8V (MAX)
. OUTPUT DRIVE CAPABILITY
10 LSTTL LOADS
. SYMMETRICAL OUTPUT IMPEDANCE
|IOH| = IOL = 4 mA (MIN.)
. BALANCED PROPAGATION DELAYS
tPLH = tPHL
. PIN AND FUNCTION COMPATIBLE
WITH 54/74LS688
8 BIT EQUALITY COMPARATOR
B1R
(Plastic Package)
F1R
(Ceramic Package)
M 1R
(Micro Package)
C1R
(Chip Carrier)
ORDER CODES :
M54HCT688F1R M74HCT688M1R
M74HCT688B1R M74HCT688C1R
PIN CONNECTIONS (top view)
DESCRIPTION
The M54/74HCT688 utilizes silicon gate C2MOS
technology to achieve operating speeds equivalent
to LSTTL devices. Along with the low power
dissipation and high noise immunity of standard
C2MOS integrated circuit, it possesses the driving
capability of 10 LSTTL load. The M54/74HCT688
compares bit for bit two 8-bit words applied on inputs
P0 - P7 and inputs Q0 - Q7 and indicates whether
or not they are equal. A single active low enable is
provided to facilitate cascading several packages to
enable comparison of words greater than 8 bits.
This integrated circuit has input and output
characteristics that are fully compatible with 54/74
LSTTL logic families. M54/74HCT devices are
designed to directly interface HSC2MOS systems
with TTL and NMOS components. They are also
plug in replacements for LSTTL devices giving a
reduction of power consumption.
All inputs are equipped with protection circuit
against static discharge and transient excess
voltage.
NC =
No Internal
Connection
February 1993
1/10
1 page  
M54/M74HCT688
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 4.5
tTHL Time
8 15 19 22 ns
tPLH Propagation
4.5
tPHL Delay Time
(Pn, Qn - P = Q)
21 32 40 48
ns
tPLH Propagation
tPHL Delay Time
(G - P = Q)
4.5
15 23 29 35
ns
CIN Input Capacitance
5 10 10 10 pF
CPD (*) Power Dissipation
Capacitance
32
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
WAVEFORM
TEST CIRCUIT ICC (Opr.)
INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF
SWITCHING CHARACTERISTICS TEST.
5/10
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet M54HCT688.PDF ] | |
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