1. All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
Device Modeling Report
Bee Technologies Inc.
COMPONENTS : CMOS DIGITAL INTEGRATED CIRCUIT
PART NUMBER : TC74ACT244FT
MANUFACTURER : TOSHIBA

2. All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
2A2
1A3
2Y2
2G
2A3
1Y3
2Y3
1G
1Y1
1Y42Y1
1A2
_
2A4
_
1Y2
2Y4
2A1
1A4
VCC
1A1
GND
U1
74ACT244
SPICE MODEL
*$
*PART NUMBER : TC74ACT244FT
*MANUFACTURER : TOSHIBA
*OCTAL BUS BUFFER, NON-INVERTED, 3-STATE OUTPUTS
*All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
.subckt 74act244 1GBAR 1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4 2Y1 DGND
+ 2A1 1Y4 2A2 1Y3 2A3 1Y2 2A4 1Y1 2GBAR DPWR
+ params: MNTYMXDLY=0 IO_LEVEL=0
UAB inva(2) DPWR DGND
+ 1GBAR 2GBAR OE1 OE2
+ D0_GATE IO_ACT244 IO_LEVEL={IO_LEVEL}
U1 buf3a(4) DPWR DGND
+ 1A1 1A2 1A3 1A4 OE1 1Y1 1Y2 1Y3 1Y4
+ D_ACT244 IO_ACT244 MNTYMXDLY={MNTYMXDLY}
+ IO_LEVEL={IO_LEVEL}
U2 buf3a(4) DPWR DGND
+ 2A1 2A2 2A3 2A4 OE2 2Y1 2Y2 2Y3 2Y4
+ D_ACT244 IO_ACT244 MNTYMXDLY={MNTYMXDLY}
+ IO_LEVEL={IO_LEVEL}
.ends
.model D_ACT244 utgate (
+ tplhmn=1ns tplhty=4.8ns tplhmx=8ns
+ tphlmn=1ns tphlty=4.6ns tphlmx=8ns
+ tpzhmn=1ns tpzhty=4.8ns tpzhmx=9ns
+ tpzlmn=1ns tpzlty=4.8ns tpzlmx=9ns
+ tphzmn=1ns tphzty=4.3ns tphzmx=8.5ns
+ tplzmn=1ns tplzty=4.3ns tplzmx=8.5ns
+ )
.model IO_ACT244 uio (
+ drvh=24.5 drvl=18.7
+ inld=5pF
+ AtoD1="AtoD_ACT244"AtoD2="AtoD_ACT244_NX"

3. All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
+ AtoD3="AtoD_ACT244"AtoD4="AtoD_ACT244_NX"
+ DtoA1="DtoA_AC244" DtoA2="DtoA_AC244"
+ DtoA3="DtoA_AC244" DtoA4="DtoA_AC244"
+ tswhl1=477ps tswlh1=470ps
+ tswhl2=477ps tswlh2=470ps
+ tswhl3=477ps tswlh3=470ps
+ tswhl4=477ps tswlh4=470ps
+ DIGPOWER="DIGIFPWR"
+ )
.subckt AtoD_ACT244 A D DPWR DGND
+ params: CAPACITANCE=0
X1 DGND A ACT_CLAMP
X2 A DPWR ACT_CLAMP
C1 A DGND {CAPACITANCE+0.01pF}
O0 A DGND DO74ACT244 DGTLNET=D IO_ACT244
.ends
.subckt AtoD_ACT244_NX A D DPWR DGND
+ params: CAPACITANCE=0
X1 DGND A ACT_CLAMP
X2 A DPWR ACT_CLAMP
C1 A DGND {CAPACITANCE+0.01pF}
O0 A DGND DO74ACT244_NX DGTLNET=D IO_ACT244
.ends
.subckt DtoA_AC244 D A DPWR DGND
+ params: DRVL=0 DRVH=0 CAPACITANCE=0
G_OH DPWR DPWR_OH
+ TABLE { V(DPWR_OH,DPWR) }
+ -5.5, 142mA,
+ -4.0, 140mA,
+ -3.0, 135mA,
+ -2.0, 120mA,
+ -0.6, 50mA,
+ 0.0, 0,
+ 0.5, -40mA
X1 A DPWR ACT_CLAMP
G_OL DGND_OL DGND
+ TABLE { V(DGND_OL,DGND) }
+ -0.5, -70mA,
+ 0, 0,
+ 1.0, 120mA,
+ 1.6, 150mA,
+ 2.0, 160mA,
+ 3.0, 170mA,
+ 5.5, 172mA,
X2 DGND A ACT_CLAMP

4. All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
N1 A DGND_OL DPWR_OH DIN74ACT244 DGTLNET=D IO_AC_DTOA
C1 A DGND {CAPACITANCE+0.01pF}
R1 A DGND 1G
.ends
.subckt ACT_Clamp A C
G_Clamp A C TABLE { V(A,C) }
+ 0.0, 8uA
+ 0.5, 1mA
+ 5.5, 1A
.ends
.model DO74ACT244 doutput (
+ s0name="X" s0vlo=0.799 s0vhi=2.0
+ s1name="0" s1vlo=-1.5 s1vhi=0.799
+ s2name="R" s2vlo=0.799 s2vhi=1.55
+ s3name="R" s3vlo=1.45 s3vhi=2.0
+ s4name="X" s4vlo=0.799 s4vhi=2.0
+ s5name="1" s5vlo=2.0 s5vhi=7.0
+ s6name="F" s6vlo=1.45 s6vhi=2.0
+ s7name="F" s7vlo=0.799 s7vhi=1.55
+ )
.model DO74ACT244_NX doutput (
+ s0name="0" s0vlo=-1.5 s0vhi=2
+ s2name="1" s2vlo=2 s2vhi=7.0
+ )
.model DIN74ACT244 dinput (
+ s0name="0" s0tsw=0.7ns s0rlo=6.0 s0rhi=1000K
+ s1name="1" s1tsw=0.7ns s1rlo=100K s1rhi=1
+ s2name="X" s2tsw=0.7ns s2rlo=104 s2rhi=100
+ s3name="R" s3tsw=0.7ns s3rlo=104 s3rhi=100
+ s4name="F" s4tsw=0.7ns s4rlo=104 s4rhi=100
+ s5name="Z" s5tsw=0.7ns s5rlo=200K s5rhi=200K
+ )
.MODEL IO_AC_DTOA UIO()
*$

5. All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
Truth Table
Circuit simulation result
Evaluation circuit
Comparison table
Input Output
G An Yn (Measurement) Yn (Simulation)
%Error
L L L L 0
TimeTime
0s 0.5us 1.0us
U1:1GBAR
U1:2GBAR
U1:1A1
U1:1A2
U1:1A3
U1:1A4
U1:2A1
U1:2A2
U1:2A3
U1:2A4
U1:1Y1
U1:1Y2
U1:1Y3
U1:1Y4
U1:2Y1
U1:2Y2
U1:2Y3
U1:2Y4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
LO
LO
V1
5
LO
LO
R1
1MEG
LO
LO
LO
LO
2A2
1A3
2Y2
2G
2A3
1Y3
2Y3
1G
1Y1
1Y42Y1
1A2
_
2A4
_
1Y2
2Y4
2A1
1A4
VCC
1A1
GND
U1
74ACT244
LO
0
LO

6. All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
Truth Table
Circuit simulation result
Evaluation circuit
Comparison table
Input Output
G An Yn (Measurement) Yn (Simulation)
%Error
L H H H 0
TimeTime
0s 0.5us 1.0us
U1:1GBAR
U1:2GBAR
U1:1A1
U1:1A2
U1:1A3
U1:1A4
U1:2A1
U1:2A2
U1:2A3
U1:2A4
U1:1Y1
U1:1Y2
U1:1Y3
U1:1Y4
U1:2Y1
U1:2Y2
U1:2Y3
U1:2Y4
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
V1
5
HI
R1
1MEG
HIHI
HI
HI
HI
0
LO
LO
HI
2A2
1A3
2Y2
2G
2A3
1Y3
2Y3
1G
1Y1
1Y42Y1
1A2
_
2A4
_
1Y2
2Y4
2A1
1A4
VCC
1A1
GND
U1
74ACT244
HI

7. All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
Truth Table
Circuit simulation result
Evaluation circuit
Comparison table
Input Output
G An Yn (Measurement) Yn (Simulation)
%Error
H X Z Z 0
TimeTime
0s 0.5us 1.0us
U1:1GBAR
U1:2GBAR
U1:1A1
U1:1A2
U1:1A3
U1:1A4
U1:2A1
U1:2A2
U1:2A3
U1:2A4
U1:1Y1
U1:1Y2
U1:1Y3
U1:1Y4
U1:2Y1
U1:2Y2
U1:2Y3
U1:2Y4
1
1
0
0
0
0
0
0
0
0
Z
Z
Z
Z
Z
Z
Z
Z
V1
5
X
2A2
1A3
2Y2
2G
2A3
1Y3
2Y3
1G
1Y1
1Y42Y1
1A2
_
2A4
_
1Y2
2Y4
2A1
1A4
VCC
1A1
GND
U1
74ACT244
HI
R1
1MEG
X
0
CLK
DSTM1
OFFTIME = .2uS
ONTIME = .2uS
HI

8. All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
High Level and Low Level Input Voltage
Circuit simulation result
Evaluation circuit
Comparison table
VCC = 5V Measurement Simulation %Error
VIH (V) 2 2 0
VIL (V) 0.8 0.799217 -0.098
Time
0s 0.5ms 1.0ms 1.5ms 2.0ms
V(OUT) V(V1:+)
0V
2.5V
5.0V
(540.005u,2.0003)
(515.984u,799.217m)
Output
Input
LO
2A2
1A3
2Y2
2G
2A3
1Y3
2Y3
1G
1Y1
1Y42Y1
1A2
_
2A4
_
1Y2
2Y4
2A1
1A4
VCC
1A1
GND
U1
74ACT244
V1
TD = 0.5m
TF = 0.1m
PW = 1m
PER = 2m
V1 = 0
TR = 0.1m
V2 = 5
V2
5
0
R1
1G
OUT
LO

9. All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
High Level and Low Level Output Voltage
Circuit simulation result
Evaluation circuit
Comparison table
VCC = 4.5V Measurement Simulation %Error
VOH (V) 4.5 4.4988 -0.027
VOL (V) 0 0 0
Time
0s 5ms 10ms
V(U1:1A1)
0V
2.5V
5.0V
V(OUT)
0V
2.5V
5.0V
SEL>>
Output
Input
LO
R1
0.09MEG
0
V1
TD = 0.5m
TF = 3n
PW = 1m
PER = 2m
V1 = 0
TR = 3n
V2 = 4.5
OUT
LO
2A2
1A3
2Y2
2G
2A3
1Y3
2Y3
1G
1Y1
1Y42Y1
1A2
_
2A4
_
1Y2
2Y4
2A1
1A4
VCC
1A1
GND
U1
74ACT244
V2
4.5

10. All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
Propagation Delay Time
Circuit simulation result
Evaluation circuit
Comparison table CL = 50 pF, RL = 500 Ω
tr = tf =3 ns Measurement Simulation %Error
tPLH (ns) 5.7 5.8228 2.154
tPHL (ns) 5.7 5.7411 0.721
Time
0s 0.5us 1.0us
1 V(TPLH_TPHL) 2 V(V1:+)
0V
2.5V
5.0V
1
0V
1.5V
3.0V
2
>>
Output
Input
V2
5
R1
500
2A2
1A3
2Y2
2G
2A3
1Y3
2Y3
1G
1Y1
1Y42Y1
1A2
_
2A4
_
1Y2
2Y4
2A1
1A4
VCC
1A1
GND
U1
74ACT244
0
LO
tplh_tphl
V1TD = 0.2u
TF = 3.8n
PW = 0.5u
PER = 1u
V1 = 0
TR = 3.8n
V2 = 3
LO
C1
50p

11. All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
Output enable time, high impedance (off) to high output (tPZH)
Output disable time, high to high impedance (off) output (tPHZ)
Circuit simulation result
Evaluation circuit
Comparison table CL = 50 pF, RL = 500 Ω
tr = tf =3 ns Measurement Simulation %Error
tPZH (ns) 6 6.0132 0.220
tPHZ (ns) 5.9 5.9843 1.429
Time
0s 0.5us 1.0us
1 V(TPZH_TPHZ) 2 V(V1:+)
0V
2.5V
5.0V
1
>>
0V
1.0V
2.0V
3.0V
2
Output
Input
0
HI
R1
5002A2
1A3
2Y2
2G
2A3
1Y3
2Y3
1G
1Y1
1Y42Y1
1A2
_
2A4
_
1Y2
2Y4
2A1
1A4
VCC
1A1
GND
U1
74ACT244
C1
50p
R2
500
tpzh_tphz
V2
5
V1TD = 0.2u
TF = 3.8n
PW = 0.5u
PER = 1u
V1 = 0
TR = 3.8n
V2 = 3
HI

12. All Rights Reserved Copyright (c) Bee Technologies Inc. 2005
Output enable time, high impedance (off) to low output (tPZL)
Output disable time, low to high impedance (off) output (tPLZ)
Circuit simulation result
Evaluation circuit
Comparison table CL = 50 pF, RL = 500 Ω
tr = tf =3 ns Measurement Simulation %Error
tPZL (ns) 6 5.9928 -0.120
tPLZ (ns) 5.9 5.9245 0.415
Time
0s 0.5us 1.0us
1 V(TPZL_TPLZ) 2 V(V1:+)
0V
2.5V
5.0V
1
0V
1.5V
3.0V
2
>>
Output
Input
V1TD = 0.2u
TF = 3.8n
PW = 0.5u
PER = 1u
V1 = 0
TR = 3.8n
V2 = 3
tpzl_tplz
V2
10
2A2
1A3
2Y2
2G
2A3
1Y3
2Y3
1G
1Y1
1Y42Y1
1A2
_
2A4
_
1Y2
2Y4
2A1
1A4
VCC
1A1
GND
U1
74ACT244
C1
50p
LO
V3
5
0
R2
500
R1
500
HI