STMICROELECTRONICS 74VHC245_04

74VHC245
OCTAL BUS
TRANSCEIVER (3-STATE)
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HIGH SPEED: tPD = 4.0 ns (TYP.) at VCC = 5V
LOW POWER DISSIPATION:
ICC = 4 µA (MAX.) at TA=25°C
HIGH NOISE IMMUNITY:
VNIH = VNIL = 28% VCC (MIN.)
POWER DOWN PROTECTION ON
CONTROL INPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 8 mA (MIN)
BALANCED PROPAGATION DELAYS:
tPLH ≅ tPHL
OPERATING VOLTAGE RANGE:
VCC(OPR) = 2V to 5.5V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 245
IMPROVED LATCH-UP IMMUNITY
LOW NOISE: VOLP = 0.9V (MAX.)
DESCRIPTION
The 74VHC245 is an advanced high-speed
CMOS OCTAL BUS TRANSCEIVER (3-STATE)
fabricated with sub-micron silicon gate and
double-layer metal wiring C2MOS technology.
This IC is intended for two-way asynchronous
communication between data busses; the
SOP
TSSOP
Table 1: Order Codes
PACKAGE
T&R
SOP
TSSOP
74VHC245MTR
74VHC245TTR
direction of data transmission is determined by
DIR input. The enable input G can be used to
disable the device so that the busses are
effectively isolated.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
All floating bus terminals during High Z State must
be held HIGH or LOW.
Figure 1: Pin Connection And IEC Logic Symbols
November 2004
Rev. 6
1/12
74VHC245
Figure 2: Input Equivalent Circuit
Table 2: Pin Description
PIN N°
SYMBOL
1
2, 3, 4, 5, 6,
7, 8, 9
18, 17, 16,
15, 14, 13,
12, 11
19
10
20
DIR
A1 to A8
Directional Control
Data Inputs/Outputs
B1 to B8
Data Inputs/Outputs
G
GND
VCC
NAME AND FUNCTION
Output Enable Input
Ground (0V)
Positive Supply Voltage
Table 3: Truth Table
INPUTS
FUNCTION
OUTPUT
G
DIR
A BUS
B BUS
L
L
H
L
H
X
OUTPUT
INPUT
Z
INPUT
OUTPUT
Z
A=B
B=A
Z
X : Don‘t Care
Z : High Impedance
Table 4: Absolute Maximum Ratings
Symbol
VCC
VI
Parameter
Value
Unit
Supply Voltage
-0.5 to +7.0
V
DC Input Voltage (DIR, G)
-0.5 to +7.0
V
VI/O
Bus I/O Voltage
-0.5 to VCC + 0.5
V
VO
DC Output Voltage
IIK
DC Input Diode Current
-0.5 to VCC + 0.5
- 20
mA
IOK
DC Output Diode Current
± 20
mA
IO
DC Output Current
± 25
mA
ICC or IGND DC VCC or Ground Current
Storage Temperature
Tstg
TL
Lead Temperature (10 sec)
V
± 75
mA
-65 to +150
°C
300
°C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
Table 5: Recommended Operating Conditions
Symbol
Value
Unit
Supply Voltage
2 to 5.5
V
Input Voltage (DIR, G)
0 to 5.5
V
VI/O
Bus I/O Voltage
0 to VCC
V
VO
Output Voltage
0 to VCC
V
Top
Operating Temperature
-55 to 125
°C
0 to 100
0 to 20
ns/V
VCC
VI
dt/dv
Parameter
Input Rise and Fall Time (note 1) (VCC = 3.3 ± 0.3V)
(VCC = 5.0 ± 0.5V)
1) VIN from 30% to 70% of VCC
2/12
74VHC245
Table 6: DC Specifications
Test Condition
Symbol
VIH
VIL
VOH
VOL
IOZ
II
ICC
Parameter
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
Low Level Output
Voltage
High Impedance
Output Leakage
Current
Input Leakage
Current
Quiescent Supply
Current
Value
TA = 25°C
VCC
(V)
Min.
2.0
3.0 to
5.5
2.0
3.0 to
5.5
Typ.
Max.
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
1.5
1.5
1.5
0.7VCC
0.7VCC
0.7VCC
Max.
V
0.5
0.5
0.5
0.3VCC
0.3VCC
0.3VCC
2.0
IO=-50 µA
1.9
2.0
1.9
1.9
3.0
IO=-50 µA
2.9
3.0
2.9
2.9
4.5
IO=-50 µA
4.4
4.5
3.0
IO=-4 mA
2.58
3.94
4.4
4.4
2.48
2.4
Unit
V
V
4.5
IO=-8 mA
2.0
IO=50 µA
0.0
0.1
0.1
0.1
3.0
IO=50 µA
0.0
0.1
0.1
0.1
4.5
IO=50 µA
0.0
0.1
0.1
0.1
3.0
IO=4 mA
0.36
0.44
0.55
4.5
IO=8 mA
0.36
0.44
0.55
5.5
VI = VIH or VIL
VO = VCC or GND
±0.25
± 2.5
± 2.5
µA
0 to
5.5
VI = 5.5V or GND
± 0.1
±1
±1
µA
5.5
VI = VCC or GND
4
40
40
µA
3.8
3.7
V
3/12
74VHC245
Table 7: AC Electrical Characteristics (Input tr = tf = 3ns)
Test Condition
Symbol
Parameter
VCC
(V)
CL
(pF)
tPLH
tPHL
Propagation Delay
Time
3.3(*)
(*)
(**)
Output Disable
Time
tPLZ
tPHZ
Output Enable
Time
tOSLH
tOSHL
Output to Output
Skew time (note 1)
TA = 25°C
-55 to 125°C
Max.
Min.
Max.
Min.
Max.
15
5.8
8.4
1.0
10.0
1.0
10.0
50
8.3
11.9
1.0
13.5
1.0
13.5
15
4.0
5.5
1.0
6.5
1.0
6.5
5.0(**)
50
5.5
7.5
1.0
8.5
1.0
8.5
3.3(*)
15
RL = 1KΩ
8.5
13.2
1.0
15.5
1.0
15.5
3.3(*)
50
RL = 1KΩ
11.0
16.7
1.0
19.0
1.0
19.0
5.0(**)
15
RL = 1KΩ
5.8
8.5
1.0
10.0
1.0
10.0
5.0(**)
1.0
12.0
1.0
12.0
3.3
Min.
-40 to 85°C
Typ.
5.0
tPZL
tPZH
Value
50
RL = 1KΩ
7.3
10.6
(*)
50
RL = 1KΩ
11.5
15.8
1.0
18.0
1.0
18.0
(**)
50
RL = 1KΩ
7.0
9.7
1.0
11.0
1.0
11.0
3.3(*)
50
1.5
1.5
1.5
5.0(**)
50
1.0
1.0
1.0
3.3
5.0
Unit
ns
ns
ns
ns
(*) Voltage range is 3.3V ± 0.3V
(**) Voltage range is 5.0V ± 0.5V
Note 1: Parameter guaranteed by design. tsoLH = |tpLHm - tpLHn|, tsoHL = |tpHLm - tpHLn|
Table 8: Capacitive Characteristics
Test Condition
Symbol
Parameter
Value
TA = 25°C
Min.
CIN
Input Capacitance
CI/O
Output
Capacitance
Power Dissipation
Capacitance
(note 1)
CPD
Typ.
Max.
4
10
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
10
Unit
Max.
10
pF
8
pF
21
pF
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)
4/12
74VHC245
Table 9: Dynamic Switching Characteristics
Test Condition
Symbol
VOLP
VOLV
VIHD
VILD
Parameter
Dynamic Low
Voltage Quiet
Output (note 1, 2)
Dynamic High
Voltage Input
(note 1, 3)
Dynamic Low
Voltage Input
(note 1, 3)
TA = 25°C
VCC
(V)
Min.
5.0
5.0
Value
-0.9
CL = 50 pF
5.0
Typ.
Max.
0.6
0.9
-40 to 85°C
-55 to 125°C
Min.
Min.
Max.
Unit
Max.
V
-0.6
3.5
V
1.5
V
1) Worst case package.
2) Max number of outputs defined as (n). Data inputs are driven 0V to 5.0V, (n-1) outputs switching and one output at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to 5.0V. Inputs under test switching: 5.0V to threshold (VILD), 0V to threshold
(VIHD), f=1MHz.
Figure 3: Test Circuit
TEST
SWITCH
tPLH, tPHL
Open
tPZL, tPLZ
VCC
tPZH, tPHZ
GND
CL =15/ 50pF or equivalent (includes jig and probe capacitance)
RL = R1 = 1KΩ or equivalent
RT = ZOUT of pulse generator (typically 50Ω)
5/12
74VHC245
Figure 4: Waveform - Propagation Delays (f=1MHz; 50% duty cycle)
Figure 5: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle)
6/12
74VHC245
SO-20 MECHANICAL DATA
DIM.
mm.
MIN.
TYP
inch
MAX.
MIN.
TYP.
MAX.
A
2.35
2.65
0.093
0.104
A1
0.1
0.30
0.004
0.012
B
0.33
0.51
0.013
0.020
C
0.23
0.32
0.009
0.013
D
12.60
13.00
0.496
0.512
E
7.4
7.6
0.291
0.299
e
1.27
0.050
H
10.00
10.65
0.394
0.419
h
0.25
0.75
0.010
0.030
L
0.4
1.27
0.016
0.050
k
0°
8°
0°
8°
ddd
0.100
0.004
0016022D
7/12
74VHC245
TSSOP20 MECHANICAL DATA
mm.
inch
DIM.
MIN.
TYP
MAX.
A
MIN.
TYP.
MAX.
1.2
A1
0.05
A2
0.8
b
0.047
0.15
0.002
0.004
0.006
1.05
0.031
0.039
0.041
0.19
0.30
0.007
0.012
c
0.09
0.20
0.004
0.0079
D
6.4
6.5
6.6
0.252
0.256
0.260
E
6.2
6.4
6.6
0.244
0.252
0.260
E1
4.3
4.4
4.48
0.169
0.173
0.176
1
e
0.65 BSC
K
0˚
L
0.45
A
0.0256 BSC
0.60
8˚
0˚
0.75
0.018
8˚
0.024
0.030
A2
A1
b
K
e
L
E
c
D
E1
PIN 1 IDENTIFICATION
1
0087225C
8/12
74VHC245
Tape & Reel SO-20 MECHANICAL DATA
mm.
inch
DIM.
MIN.
A
TYP
MAX.
MIN.
330
MAX.
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
TYP.
0.504
30.4
0.519
1.197
Ao
10.8
11
0.425
0.433
Bo
13.2
13.4
0.520
0.528
Ko
3.1
3.3
0.122
0.130
Po
3.9
4.1
0.153
0.161
P
11.9
12.1
0.468
0.476
9/12
74VHC245
Tape & Reel TSSOP20 MECHANICAL DATA
mm.
inch
DIM.
MIN.
A
MAX.
MIN.
330
13.2
TYP.
MAX.
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
10/12
TYP
0.504
22.4
0.519
0.882
Ao
6.8
7
0.268
0.276
Bo
6.9
7.1
0.272
0.280
Ko
1.7
1.9
0.067
0.075
Po
3.9
4.1
0.153
0.161
P
11.9
12.1
0.468
0.476
74VHC245
Table 10: Revision History
Date
Revision
12-Nov-2004
6
Description of Changes
Order Codes Revision - pag. 1.
11/12
74VHC245
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
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