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74LCX646 Datasheet(PDF) 7 Page - STMicroelectronics

Part No. 74LCX646
Description  LOW VOLT. CMOS OCTAL BUS TRANSCEIVER/REGISTER WITH 5 VOLT TOLERANT INPUTS AND OUTPUTS(3-STATE)
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74LCX646 Datasheet(HTML) 7 Page - STMicroelectronics

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AC ELECTRICAL CHARACTERISTICS
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-
ing in the same direction, either HIGH or LOW (tOSLH = | tPLHm - tPLHn|, tOSHL = | tPHLm - tPHLn|)
2) Parameter guaranteed by design
CAPACITIVE CHARACTERISTICS
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/8 (per circuit)
Symbol
Parameter
Test Condition
Value
Unit
VCC
(V)
CL
(pF)
RL
(
Ω)
ts = tr
(ns)
-40 to 85 °C
-55 to 125 °C
Min.
Max.
Min.
Max.
tPLH tPHL
Propagation Delay
Time (CAB or CBA
to An or Bn)
2.7
50
500
2.5
1.5
9.5
1.5
9.5
ns
3.0 to 3.6
1.5
8.5
1.5
8.5
tPLH tPHL
Propagation Delay
Time (An to Bn or Bn
to An)
2.7
50
500
2.5
1.5
8.0
1.5
8.0
ns
3.0 to 3.6
1.5
7.0
1.5
7.0
tPLH tPHL
Propagation Delay
Time (SAB or SBA
to An or Bn)
2.7
50
500
2.5
1.5
9.5
1.5
9.5
ns
3.0 to 3.6
1.5
8.5
1.5
8.5
tPZL tPZH
Output Enable Time
(G, DIR to An, Bn)
2.7
50
500
2.5
1.5
9.5
1.5
9.5
ns
3.0 to 3.6
1.5
8.5
1.5
8.5
tPLZ tPHZ
Output Disable Time
(G, DIR to An, Bn)
2.7
50
500
2.5
1.5
9.5
1.5
9.5
ns
3.0 to 3.6
1.5
8.5
1.5
8.5
tS
Setup Time, HIGH or
LOW level Data to
CAB, CBA
2.7
50
500
2.5
2.5
2.5
ns
3.0 to 3.6
2.5
2.5
th
Hold Time, HIGH or
LOW level Data to
CAB, CBA
2.7
50
500
2.5
1.5
1.5
ns
3.0 to 3.6
1.5
1.5
tW
CAB, CBA Pulse
Width, HIGH or
LOW
2.7
50
500
2.5
4.0
4.0
ns
3.0 to 3.6
3.3
3.3
fMAX
Clock Pulse
Frequency
3.0 to 3.6
50
500
2.5
150
150
MHz
tOSLH
tOSHL
Output To Output
Skew Time (note1,
2)
3.0 to 3.6
50
500
2.5
1.0
1.0
ns
Symbol
Parameter
Test Condition
Value
Unit
VCC
(V)
TA = 25 °C
Min.
Typ.
Max.
CIN
Input Capacitance
3.3
VIN = 0 to VCC
6pF
CI/O
I/O Capacitance
3.3
VIN = 0 to VCC
10
pF
CPD
Power Dissipation Capacitance
(note 1)
3.3
fIN = 10MHz
VIN = 0 or VCC
37
pF


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