SPICE MODEL of TC74VHCT08AFT in SPICE PARK. English Version is http://www.spicepark.net. Japanese Version is http://www.spicepark.com by Bee Technologies.

1. Device Modeling Report
COMPONENTS : CMOS DIGITAL INTEGRATED CIRCUIT
PART NUMBER : TC74VHCT08AFT
MANUFACTURER : TOSHIBA
Bee Technologies Inc.
All Rights Reserved Copyright (C) Bee Technologies Inc. 2005

2. Truth Table
Circuit simulation result
U1:1A 0
U1:1B 0
U1:2A 0
U1:2B 0
U1:3A 0
U1:3B 0
U1:4A 0
U1:4B 0
Y1 0
Y2 0
Y3 0
Y4 0
0s 0.5us 1.0us
Time
Evaluation circuit
U1
LO
1A VCC
1B 4B
LO LO
1Y 4A
Y1 LO
2A 4Y
LO Y4
2B 3B
LO LO
R1 V1
2Y 3A
Y2 LO
1MEG 5
GND 3Y
Y3
74VHCT08
0
Comparison table
Input Output
%Error
An Bn Yn (Measurement) Yn (Simulation)
L L L L 0
All Rights Reserved Copyright (C) Bee Technologies Inc. 2005

3. Truth Table
Circuit simulation result
U1:1A 0
U1:1B 1
U1:2A 0
U1:2B 1
U1:3A 0
U1:3B 1
U1:4A 0
U1:4B 1
Y1 0
Y2 0
Y3 0
Y4 0
0s 0.5us 1.0us
Time
Evaluation circuit
U1
LO
1A VCC
HI
1B 4B HI
1Y 4A
Y1 LO
2A 4Y
LO Y4
HI
2B 3B HI
R1 V1
2Y 3A
Y2 LO
1MEG 5
GND 3Y
Y3
74VHCT08
0
Comparison table
Input Output
%Error
An Bn Yn (Measurement) Yn (Simulation)
L H L L 0
All Rights Reserved Copyright (C) Bee Technologies Inc. 2005

4. Truth Table
Circuit simulation result
U1:1A 1
U1:1B 0
U1:2A 1
U1:2B 0
U1:3A 1
U1:3B 0
U1:4A 1
U1:4B 0
Y1 0
Y2 0
Y3 0
Y4 0
0s 0.5us 1.0us
Time
Evaluation circuit
U1
HI 1A VCC
1B 4B
LO LO
1Y 4A HI
Y1
HI 2A 4Y
Y4
2B 3B
LO LO
R1 V1
2Y 3A HI
Y2
1MEG 5
GND 3Y
Y3
74VHCT08
0
Comparison table
Input Output
%Error
An Bn Yn (Measurement) Yn (Simulation)
H L L L 0
All Rights Reserved Copyright (C) Bee Technologies Inc. 2005

5. Truth Table
Circuit simulation result
U1:1A 1
U1:1B 1
U1:2A 1
U1:2B 1
U1:3A 1
U1:3B 1
U1:4A 1
U1:4B 1
Y1 1
Y2 1
Y3 1
Y4 1
0s 0.5us 1.0us
Time
Evaluation circuit
U1
HI 1A VCC
HI
1B 4B HI
1Y 4A HI
Y1
HI 2A 4Y
Y4
HI
2B 3B HI
R1 V1
2Y 3A HI
Y2
1MEG 5
GND 3Y
Y3
74VHCT08
0
Comparison table
Input Output
%Error
An Bn Yn (Measurement) Yn (Simulation)
H H H H 0
All Rights Reserved Copyright (C) Bee Technologies Inc. 2005

6. High Level and Low Level Input Voltage
Circuit simulation result
5.0V
Output
2.5V Input
0V
0s 1.0ms 2.0ms 3.0ms 4.0ms
V(R1:1) V(V1:+)
Time
Evaluation circuit
U1
1A VCC
HI
1B 4B
1Y 4A
2A 4Y
2B 3B
V1 2Y 3A
V1 = 0
V2 = 5 R1 GND 3Y V2
TD = 0.5m
TR = 0.1m 1MEG
74VHCT08
TF = 0.1m 5
PW = 1m
PER = 2m
0
Comparison table
VCC = 5V Measurement Simulation %Error
VIH (V) 2 2 0
VIL (V) 0.8 0.799245 -0.094
All Rights Reserved Copyright (C) Bee Technologies Inc. 2005

7. High Level and Low Level Output Voltage
Circuit simulation result
5.0V
2.5V
SEL>>
0V
Output
V(R1:1) Input
5.0V
2.5V
0V
0s 5ms 10ms
V(V1:+)
Time
Evaluation circuit
U1
1A VCC
HI
1B 4B
1Y 4A
2A 4Y
2B 3B
V1 2Y 3A
V1 = 0
V2 = 4.5 R1 GND 3Y V2
TD = 0.5m
TR = 3n 1MEG
74VHCT08
TF = 3n 4.5
PW = 1m
PER = 2m
0
Comparison table
VCC = 4.5V Measurement Simulation %Error
VOH (V) 4.5 4.4988 -0.027
VOL (V) 0 0 0
All Rights Reserved Copyright (C) Bee Technologies Inc. 2005

8. Propagation Delay Time
Circuit simulation result
5.0V
Output
2.5V Input
0V
0s 50ns 100ns
V(C1:1) V(V1:+)
Time
Evaluation circuit
U1
1A VCC
HI
1B 4B
1Y 4A
2A 4Y
2B 3B
V1 = 0 V1 2Y 3A V2
V2 = 5
TD = 10n GND 3Y
TR = 3n C1
TF = 3n 15p 5
74VHCT08
PW = 50n
PER = 100n
0
Comparison table
CL=15pF,VCC=5 V,Tr=Tf=3ns Measurement Simulation %Error
tpLH (ns) 5 5.0747 1.494
tpHL (ns) 5 5.0406 0.812
All Rights Reserved Copyright (C) Bee Technologies Inc. 2005