HD74HC245
Octal Bus Transceivers (with 3-state outputs)
REJ03D0598–0200
(Previous ADE-205-475)
Rev.2.00
Jan 31, 2006
Description
Each device has an active low enable input
G
and a direction control input, DIR. When DIR is high, data flows from
the A inputs to the B outputs. When DIR is low, data flows from the B inputs to the A outputs. The HD74HC245
transfers true data from one bus to the other. This device does not have schmitt trigger inputs.
Features
•
•
•
•
•
•
High Speed Operation: t
pd
= 8 ns typ (C
L
= 50 pF)
High Output Current: Fanout of 15 LSTTL Loads
Wide Operating Voltage: V
CC
= 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: I
CC
(static) = 4 µA max (Ta = 25°C)
Ordering Information
Part Name
HD74HC245P
HD74HC245FPEL
HD74HC245RPEL
HD74HC245TELL
Package Type
DILP-20 pin
SOP-20 pin (JEITA)
SOP-20 pin (JEDEC)
TSSOP-20 pin
Package Code
(Previous Code)
PRDP0020AC-B
(DP-20NEV)
PRSP0020DD-B
(FP-20DAV)
PRSP0020DC-A
(FP-20DBV)
Package
Abbreviation
P
FP
RP
—
EL (2,000 pcs/reel)
EL (1,000 pcs/reel)
ELL (2,000 pcs/reel)
Taping Abbreviation
(Quantity)
PTSP0020JB-A
T
(TTP-20DAV)
Note: Please consult the sales office for the above package availability.
Function Table
Enable G
L
L
H
high level
low level
irrelevant
Direction Control DIR
L
H
X
Operation
B data to A bus
A data to B bus
Isolation
H :
L :
X :
Rev.2.00 Jan 31, 2006 page 1 of 7
HD74HC245
Pin Arrangement
DIR
A
1
A
2
A
3
A
4
A
5
A
6
A
7
A
8
GND
1
2
3
4
5
6
7
8
9
10
(Top view)
20
19
18
17
16
15
14
13
12
11
V
CC
Enable
G
B
1
B
2
B
3
B
4
B
5
B
6
B
7
B
8
Absolute Maximum Ratings
Item
Supply voltage range
Input / Output voltage
Input / Output diode current
Output current
V
CC
, GND current
Power dissipation
Storage temperature
Symbol
V
CC
V
IN
, V
OUT
I
IK
, I
OK
I
O
I
CC
or I
GND
P
T
Tstg
Ratings
–0.5 to 7.0
–0.5 to V
CC
+0.5
±20
±35
±75
500
–65 to +150
Unit
V
V
mA
mA
mA
mW
°
C
Note: The absolute maximum ratings are values, which must not individually be exceeded, and furthermore, no two of
which may be realized at the same time.
Recommended Operating Conditions
Item
Supply voltage
Input / Output voltage
Operating temperature
Input rise / fall time
*1
Symbol
V
CC
V
IN
, V
OUT
Ta
t
r
, t
f
Ratings
2 to 6
0 to V
CC
Unit
V
V
Conditions
–40 to 85
0 to 1000
0 to 500
0 to 400
Notes: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
°
C
ns
V
CC
= 2.0 V
V
CC
= 4.5 V
V
CC
= 6.0 V
Rev.2.00 Jan 31, 2006 page 2 of 7
HD74HC245
Electrical Characteristics
Item
Input voltage
Symbol V
CC
(V)
V
IH
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
2.0
4.5
6.0
4.5
6.0
6.0
6.0
6.0
Ta = 25°C
Min
Typ Max
1.5
—
—
3.15
—
—
4.2
—
—
—
—
0.5
—
—
1.35
—
—
1.8
1.9
2.0
—
4.4
4.5
—
5.9
6.0
—
4.18
—
—
5.68
—
—
—
0.0
0.1
—
0.0
0.1
—
0.0
0.1
—
—
0.26
—
—
0.26
—
—
±0.5
—
—
—
—
±0.1
4.0
Ta = –40 to+85°C
Unit
Test Conditions
Min
Max
1.5
—
V
3.15
—
4.2
—
—
0.5
V
—
1.35
—
1.8
1.9
—
V Vin = V
IH
or V
IL
I
OH
= –20
µA
4.4
—
5.9
—
4.13
—
I
OH
= –6 mA
5.63
—
I
OH
= –7.8 mA
—
0.1
V Vin = V
IH
or V
IL
I
OL
= 20
µA
—
0.1
—
0.1
—
0.33
I
OL
= 6 mA
—
0.33
I
OL
= 7.8 mA
—
±5.0
µA
Vin = V
IH
or V
IL
,
Vout = V
CC
or GND
—
±1.0
µA
Vin = V
CC
or GND
—
40
µA
Vin = V
CC
or GND, Iout = 0
µA
V
IL
Output voltage
V
OH
V
OL
Off-state output
current
Input current
Quiescent supply
current
I
OZ
Iin
I
CC
Rev.2.00 Jan 31, 2006 page 3 of 7
HD74HC245
Switching Characteristics
(C
L
= 50 pF, Input t
r
= t
f
= 6 ns)
Item
Propagation delay
time
Symbol V
CC
(V)
t
PHL
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
2.0
4.5
6.0
—
Ta = 25°C
Min
Typ Max
—
—
90
—
12
18
—
—
15
—
—
90
—
10
18
—
—
15
—
—
150
—
11
30
—
—
26
—
—
150
—
12
30
—
—
26
—
—
150
—
16
30
—
—
26
—
—
150
—
—
—
—
—
—
19
—
—
4
—
5
30
26
60
12
10
10
Ta = –40 to +85°C
Unit
Min
Max
—
115
ns
—
23
—
20
—
115
ns
—
23
—
20
—
190
ns
—
38
—
33
—
190
ns
—
38
—
33
—
190
ns
—
38
—
33
—
190
ns
—
—
—
—
—
—
38
33
75
15
13
10
Test Conditions
t
PLH
Output enable time
t
ZL
t
ZH
Output disable
time
t
LZ
t
HZ
Output rise/fall
time
Input capacitance
t
TLH
t
THL
Cin
ns
pF
Test Circuit
V
CC
V
CC
G
See Function Table
Input
Pulse Generator
Z
out
= 50
Ω
Output
A1
B1
C
L
=
50 pF
DIR
TEST
t
PLH
/ t
PHL
t
ZH
/ t
HZ
t
ZL
/ t
LZ
S2
OPEN
GND
V
CC
S1
1 K
Ω
S2
OPEN
GND
V
CC
Note : 1. C
L
includes probe and jig capacitance.
2. A2–B2, A3–B3, A4–B4, A5–B5, A6–B6, A7–B7, A8–B8 are identical to above load circuit.
3. S1 is a input / output switch.
Rev.2.00 Jan 31, 2006 page 4 of 7
HD74HC245
Waveforms
•
Waveform – 1
t
r
90 %
50 %
10 %
t
PLH
90 %
Output Y
50 %
10 %
t
TLH
90 %
50 %
10 %
t
PHL
90 %
50 %
10 %
t
THL
t
f
V
CC
0V
Input A
V
OH
V
OL
•
Waveform – 2
90 %
Input G
t
f
t
r
90 %
50 %
10 %
t
LZ
V
CC
0V
V
OH
50 %
10 %
t
ZL
Waveform – A
t
ZH
Waveform – B
50 %
10 %
t
HZ
90 %
V
OL
V
OH
V
OL
50 %
Notes : 1. Input waveform : PRR
≤
1 MHz, duty cycle 50%, t
r
≤
6 ns, t
f
≤
6 ns
2. Waveform– A is for an output with internal conditions such that the
output is low except when disabled by the output control.
3. Waveform– B is for an output with internal conditions such that the
output is high except when disabled by the output control.
4. The output are measured one at a time with one transition per measurement.
Rev.2.00 Jan 31, 2006 page 5 of 7
FPGA/CPLD
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