INTEGRATED CIRCUITS
74LVC245A/74LVCH245A
Octal bus transceiver with direction pin
with 5-volt tolerant inputs/outputs
(3-State)
Product specification
Supersedes data of 1997 Dec 19
IC24 Data Handbook
1998 May 20
Philips
Semiconductors
Philips Semiconductors
Product specification
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
74LVC245A
74LVCH245A
FEATURES
•
5-volt tolerant inputs/outputs, for interfacing with 5-volt logic
•
Supply voltage range of 2.7V to 3.6V
•
Complies with JEDEC standard no. 8-1A
•
CMOS low power consumption
•
Direct interface with TTL levels
•
High impedance when V
CC
= 0V
•
Bushold on all data inputs (74LVCH245A only)
DESCRIPTION
The 74LVC245A/74LVCH245A is a high-performance, low-power,
low-voltage, Si-gate CMOS device, superior to most advanced
CMOS compatible TTL families.
Inputs can be driven from either 3.3V or 5V devices. In 3-State
operation, outputs can handle 5V. These features allow the use of
these devices as translators in a mixed 3.3V/5V environment.
The 74LVC245A/74LVCH245A is an octal transceiver featuring
non-inverting 3-State bus compatible outputs in both send and
receive directions. The ’245’ features an output enable (OE) input for
easy cascading and a send/receive (DIR) input for direction control.
OE controls the outputs so that the buses are effectively isolated.
The ’245’ is functionally identical to the ’640’, but the ’640’ has true
(non-inverting) outputs.
QUICK REFERENCE DATA
SYMBOL
t
PHL
/t
PLH
C
I
C
I/O
C
PD
PARAMETER
Propagation delay
A
n
to B
n;
B
n
to A
n
Input capacitance
Input/output capacitance
Power dissipation capacitance per
buffer
Notes 1 and 2
CONDITIONS
C
L
= 50pF
V
CC
= 3.3V
TYPICAL
3.6
5.0
10.0
33
UNIT
ns
pF
pF
pF
NOTE:
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
mW):
P
D
= C
PD
x V
CC2
x f
i
+
S
(C
L
x V
CC2
x f
o
) where:
f
i
= input frequency in MHz; C
L
= output load capacity in pF;
f
o
= output frequency in MHz; V
CC
= supply voltage in V;
S
(C
L
x V
CC2
x f
o
) = sum of outputs.
2. The condition is V
I
= GND to V
CC
ORDERING INFORMATION
PACKAGES
20-Pin Plastic Shrink Small Outline (SO)
20-Pin Plastic Shrink Small Outline (SSOP) Type II
20-Pin Plastic Thin Shrink Small Outline (TSSOP) Type I
20-Pin Plastic Shrink Small Outline (SO)
20-Pin Plastic Shrink Small Outline (SSOP) Type II
20-Pin Plastic Thin Shrink Small Outline (TSSOP) Type I
TEMPERATURE
RANGE
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
–40°C to +85°C
OUTSIDE
NORTH AMERICA
74LVC245A D
74LVC245A DB
74LVC245A PW
74LVCH245A D
74LVCH245A DB
74LVCH245A PW
NORTH AMERICA
74LVC245A D
74LVC245A DB
7LVC245APW DH
74LVCH245A D
74LVCH245A DB
LVCH245APW DH
PKG. DWG. #
SOT163-1
SOT339-1
SOT360-1
SOT163-1
SOT339-1
SOT360-1
1998 May 20
2
853-2044 19419
Philips Semiconductors
Product specification
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
74LVC245A
74LVCH245A
PIN CONFIGURATION
DIR
A0
A1
A2
A3
A4
A5
A6
A7
1
2
3
4
5
6
7
8
9
20
19
18
17
16
15
14
13
12
11
V
CC
OE
LOGIC SYMBOL
1
DIR
19
2
18
A1
3
17
A2
4
16
A3
B5
B6
B7
A5
7
13
A6
8
12
B6
B5
A4
6
14
B4
5
15
B3
B2
B1
B0
OE
A0
B0
B1
B2
B3
B4
GND 10
SV00014
PIN DESCRIPTION
PIN NUMBER
1
2, 3, 4, 5, 6,
7, 8, 9
10
18, 17, 16, 15,
14, 13, 12, 11
19
20
SYMBOL
DIR
A
0
to A
7
GND
B
0
to B
7
OE
V
CC
FUNCTION
Direction control
Data inputs/outputs
Ground (0V)
19
A7
9
B7
SV00016
11
LOGIC SYMBOL (IEEE/IEC)
G3
3EN1 (BA)
1
3EN2 (AB)
Data inputs/outputs
Output enable input (active-Low)
Positive supply voltage
2
3
∇
1
2
∇
18
17
16
15
14
13
12
11
FUNCTION TABLE
INPUTS
OE
L
L
H
H
L
X
Z
DIR
L
H
X
An
INPUTS/OUTPUTS
B
0
Inputs
B=A
Z
4
5
6
7
8
9
A=B
lnputs
Z
= HIGH voltage level
= LOW voltage level
= Don’t care
= High impedance OFF-state
SV00208
1998 May 20
3
Philips Semiconductors
Product specification
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
74LVC245A
74LVCH245A
RECOMMENDED OPERATING CONDITIONS
LIMITS
SYMBOL
PARAMETER
DC supply voltage (for max. speed performance)
V
CC
V
I
V
O
T
amb
t
r
, t
f
DC supply voltage (for low-voltage applications)
DC Input voltage range
DC Output voltage range; output HIGH or LOW
state
DC output voltage range; output 3-State
Operating ambient temperature range in free-air
Input rise and fall times
V
CC
= 1.2 to 2.7V
V
CC
= 2.7 to 3.6V
CONDITIONS
MIN
2.7
1.2
0
0
0
–40
0
0
MAX
3.6
V
3.6
5.5
V
CC
5.5
+85
20
10
°C
ns/V
V
V
UNIT
ABSOLUTE MAXIMUM RATINGS
1
In accordance with the Absolute Maximum Rating System (IEC 134)
Voltages are referenced to GND (ground = 0V)
SYMBOL
V
CC
I
IK
V
I
I
OK
V
O
I
O
I
GND
, I
CC
T
stg
P
TOT
PARAMETER
DC supply voltage
DC input diode current
DC input voltage
DC output diode current
DC output voltage; output HIGH or LOW state
DC output voltage; output 3-State
DC output source or sink current
DC V
CC
or GND current
Storage temperature range
Power dissipation per package
– plastic mini-pack (SO)
– plastic shrink mini-pack (SSOP and TSSOP)
above +70°C derate linearly with 8 mW/K
above +60°C derate linearly with 5.5 mW/K
V
I
t0
Note 2
V
O
uV
CC
or V
O
t
0
Note 2
Note 2
V
O
= 0 to V
CC
CONDITIONS
RATING
–0.5 to +6.5
–50
–0.5 to +6.5
"50
–0.5 to V
CC
+0.5
–0.5 to 6.5
"50
"100
–65 to +150
500
500
UNIT
V
mA
V
mA
V
mA
mA
°C
mW
NOTES:
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
2. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
1998 May 20
4
Philips Semiconductors
Product specification
Octal bus transceiver with direction pin with
5-volt tolerant inputs/outputs (3-State)
74LVC245A
74LVCH245A
DC ELECTRICAL CHARACTERISTICS
Over recommended operating conditions voltages are referenced to GND (ground = 0V)
LIMITS
SYMBOL
PARAMETER
TEST CONDITIONS
Temp = -40°C to +85°C
MIN
V
IH
HIGH level Input voltage
V
CC
= 1.2V
V
CC
= 2.7 to 3.6V
LOW level Input voltage
V
CC
= 1.2V
V
CC
= 2.7 to 3.6V
V
CC
= 2.7V; V
I
= V
IH
or V
IL
; I
O
= –12mA
V
O
OH
HIGH level output voltage
V
CC
= 3.0V; V
I
= V
IH
or V
IL
; I
O
= –100µA
V
CC
= 3.0V; V
I
= V
IH
or V
IL;
I
O
= –18mA
V
CC
= 3.0V; V
I
= V
IH
or V
IL;
I
O
= –24mA
V
CC
= 2.7V; V
I
= V
IH
or V
IL
; I
O
= 12mA
V
OL
LOW level output voltage
V
CC
= 3.0V; V
I
= V
IH
or V
IL
; I
O
= 100µA
V
CC
= 3.0V; V
I
= V
IH
or V
IL;
I
O
= 24mA
I
I
I
OZ
I
off
I
CC
∆I
CC
I
BHL
I
BHH
I
BHLO
I
BHHO
Input leakage current
6
3-State output OFF-state current
6, 7
Power off leakage supply
Quiescent supply current
Additional quiescent supply current
per input pin
Bushold LOW sustaining
current
2, 3, 4
Bushold HIGH sustaining
current
2, 3, 4
Bushold LOW overdrive current
2, 3, 5
Bushold HIGH overdrive current
2, 3, 5
V
CC
= 3.6V; V
I
= 5.5V or GND
V
CC
= 3.6V; V
I
= V
IH
or V
IL
; V
O
= 5.5V or GND
V
CC
= 0.0V; V
I
or V
O
= 5.5V
V
CC
= 3.6V; V
I
= V
CC
or GND; I
O
= 0
V
CC
= 2.7V to 3.6V; V
I
= V
CC
–0.6V; I
O
= 0
V
CC
= 3.0V; V
I
=0.8V
V
CC
= 3.0V; V
I
=2.0V
V
CC
= 3.6V
V
CC
= 3.6V
75
–75
500
–500
"0.1
0.1
0.1
0.1
5
–
–
–
–
V
CC
*0.5
V
CC
*0.2
V
CC
*0.6
V
CC
*0.8
0.40
0.20
0.55
"5
"5
"10
10
500
–
–
–
–
µA
µA
µA
µA
µA
µA
µA
µA
µA
V
V
CC
V
V
CC
2.0
GND
V
0.8
TYP
1
MAX
V
UNIT
V
IL
NOTES:
1. All typical values are at V
CC
= 3.3V and T
amb
= 25°C.
2. Valid for data inputs of bushold parts (LVCH-A) only.
3. For data inputs only, control inputs do not have a bushold circuit.
4. The specified sustaining current at the data input holds the input below the specified V
I
level.
5. The specified overdrive current at the data input forces the data input to the opposite logic input state.
6. For bushold parts, the bushold circuit is switched off when V
I
exceeds V
CC
allowing 5.5V on the input terminal.
7. For I/O ports the parameter I
OZ
includes the input leakage current.
1998 May 20
5
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