Rev.2.00 Jan 31, 2006 page 1 of 7
HD74HC244
Octal Buffers/Line Drivers/Line Receivers
(with noninverted 3-state outputs) REJ03D0597–0200
(Previous ADE-205-474)
Rev.2.00
Jan 31, 2006
Description
The HD74HC244 is a non-inverting buffer and has two active low enables (1G and 2G). Each enable independently
controls 4 buf f e rs.
This device does not have schmitt trigger inputs.
Features
• High Speed Operation: tpd = 11 ns typ (CL = 50 pF)
• High Output Current: Fanout of 15 LSTTL Loads
• Wide Operating Voltage: VCC = 2 to 6 V
• Low Input Current: 1 µA max
• Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
• Ordering Information
Part Name Package Type Package Code
(Previous Code) Package
Abbreviation Taping Abbreviation
(Quantity)
HD74HC244P DILP-20 pin PRDP0020AC-B
(DP-20NEV) P —
HD74HC244FPEL SOP-20 pin (JEITA) PRSP0020DD-B
(FP-20DAV) FP EL (2,000 pcs/reel)
HD74HC244RPEL SOP-20 pin (JEDEC) PRSP0020DC-A
(FP-20DBV) RP EL (1,000 pcs/reel)
HD74HC244TELL TSSOP-20 pin PTSP0020JB-A
(TTP-20DAV) T ELL(2,000 pcs/reel)
Note: Please consult the sales office for the above packa ge availability.
Function Table
Inputs Output
G A Y
H X Z
L H H
L L L
H : high level
L : low level
X : irrelevant
Z : off (high-impedance) state of a 3-state output
HD74HC244
Rev.2.00 Jan 31, 2006 page 2 of 7
Pin Arrangement
1
2
3
4
5
6
7
8
9
10
1G1
1A1
2Y4
1A2
2Y3
1A3
2Y2
1A4
2Y1
GND
VCC
2G
1Y1
2A4
1Y2
2A3
1Y3
2A2
1Y4
2A1
20
19
18
17
16
15
14
13
12
11
(Top view)
Logic Diagram
Strobe G
Input A
To three other
7 inverters
One of 8
inverters
V
CC
Y
HD74HC244
Rev.2.00 Jan 31, 2006 page 3 of 7
Absolute Maximum Ratings
Item Symbol Ratings Unit
Supply voltage range VCC –0.5 to 7.0 V
Input / Output voltage VIN, VOUT –0.5 to VCC +0.5 V
Input / Output diode current IIK, IOK ±20 mA
Output current IO ±35 mA
VCC, GND current ICC or IGND ±75 mA
Power dissipation PT 500 mW
Storage temperature Tstg –65 to +150 °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 Symbol Ratings Unit Conditions
Supply voltage VCC 2 to 6 V
Input / Output voltage VIN, VOUT 0 to VCC V
Operating temperature Ta –40 to 85 °C
0 to 1000 VCC = 2.0 V
0 to 500 VCC = 4.5 V
Input rise / fall time*1 t
r, tf
0 to 400
ns
VCC = 6.0 V
Notes: 1. This item guarantees maximum limit when one input switches.
Waveform: Refer to test circuit of switching characteristics.
Electrical Characteristics
Ta = 25°C Ta = –40 to+85°CItem Symbol VCC (V) Min Typ Max Min Max Unit Test Conditions
2.0 1.5 — — 1.5 —
4.5 3.15 — — 3.15 —
VIH
6.0 4.2 — — 4.2 —
V
2.0 — — 0.5 — 0.5
4.5 — — 1.35 — 1.35
Input voltage
VIL
6.0 — — 1.8 — 1.8
V
2.0 1.9 2.0 — 1.9 —
4.5 4.4 4.5 — 4.4 —
6.0 5.9 6.0 — 5.9 —
IOH = –20 µA
4.5 4.18 — — 4.13 — IOH = –6 mA
VOH
6.0 5.68 — — 5.63 —
V Vin = VIH or VIL
IOH = –7.8 mA
2.0 — 0.0 0.1 — 0.1
4.5 — 0.0 0.1 — 0.1
6.0 — 0.0 0.1 — 0.1
IOL = 20 µA
4.5 — — 0.26 — 0.33 IOL = 6 mA
Output voltage
VOL
6.0 — — 0.26 — 0.33
V Vin = VIH or VIL
IOL = 7.8 mA
Off-state output
current IOZ 6.0 — — ±0.5 — ±5.0 µA Vin = VIH or VIL,
Vout = VCC or GND
Input current Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND
Quiescent supply
current ICC 6.0 — — 4.0 — 40 µA Vin = VCC or GND, Iout = 0 µA
HD74HC244
Rev.2.00 Jan 31, 2006 page 4 of 7
Switching Characteristics
(CL = 50 pF, Input tr = tf = 6 ns)
Ta = 25°C Ta = –40 to +85°C
Item Symbol VCC (V) Min Typ Max Min Max Unit Test Conditions
2.0 — — 90 — 115
4.5 — 12 18 — 23
tPHL
6.0 — — 15 — 20
ns
2.0 — — 90 — 115
4.5 — 10 18 — 23
Propagation delay
time
tPLH
6.0 — — 15 — 20
ns
2.0 — — 150 — 190
4.5 — 11 30 — 38
tZL
6.0 — — 26 — 33
ns
2.0 — — 150 — 190
4.5 — 12 30 — 38
Output enable time
tZH
6.0 — — 26 — 33
ns
2.0 — — 150 — 190
4.5 — 16 30 — 38
tLZ
6.0 — — 26 — 33
ns
2.0 — — 150 — 190
4.5 — 19 30 — 38
Output disable
time
tHZ
6.0 — — 26 — 33
ns
2.0 — — 60 — 75
4.5 — 4 12 — 15
Output rise/fall
time tTLH
tTHL 6.0 — — 10 — 13
ns
Input capacitance Cin — — 5 10 — 10 pF
Test Circuit
V
CC
OPEN
GND
C =
50 pF
1G, 2G
Z
out
= 50 Ω
Input 1 kΩ
V
CC
V
CC
V
CC
S1
L
Output
TEST S1
t / t
PLH PHL
OPEN
GND
t / t
ZH HZ
t / t
ZL LZ
1A1 to 2A4
1Y1 to 2Y4
Note : 1. C
L
includes probe and jig capacitance.
See Function Table
Pulse Generator
HD74HC244
Rev.2.00 Jan 31, 2006 page 5 of 7
Waveforms
t
PLH
t
PHL
V
OH
V
OH
V
OL
V
OL
0 V
V
CC
50 %
50 % 50 %
50 %
50 %
50 %
•
Waveform – 1
•
Waveform – 2
Input A
Output Y
10 %
90 %
t
f
10 %
90 %
t
r
t
r
t
f
t
ZL
0 V
V
OL
V
CC
V
OH
t
LZ
t
ZH
t
HZ
10 % 10 %
90 % 90 %
50 % 50 %
Input G
Waveform – A
Waveform – B
90 %
10 %
10 %
90 %
10 %
90 %
t
THL
t
TLH
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.
HD74HC244
Rev.2.00 Jan 31, 2006 page 6 of 7
Package Dimensions
7.62
DP-20NEV
RENESAS CodeJEITA Package Code Previous Code
MaxNomMin
Dimension in Millimeters
Symbol
Reference
24.50
6.30
5.08
MASS[Typ.]
1.26g
A
Z
b
D
E
A
b
c
θ
e
L
1
1
p
3
e
0.51
0.56
1.30
0.19 0.25 0.31
2.29 2.54 2.79
0
°
15
°
PRDP0020AC-BP-DIP20-6.3x24.5-2.54
25.40
7.00
0.40 0.48
1.27
2.54
1
p
1
3
110
20 11
e
b
A
LA
Z
e c
E
D
b
0.89
θ
( Ni/Pd/Au plating )
0.80
0.15
1.27
7.50 8.00
0.400.34
p
A
1
13.0
FP-20DAV
RENESAS CodeJEITA Package Code Previous Code
MaxNomMin
Dimension in Millimeters
Symbol
Reference
2.20
0.900.700.50
5.50
0.200.100.00
0.46
0.250.200.15
7.80
8
°
0
°
0.12
1.15
12.60
0.31g
MASS[Typ.]
1
E
1
1
2
L
Z
H
y
x
θ
c
b
A
E
D
b
c
e
e
L
A
P-SOP20-5.5x12.6-1.27 PRSP0020DD-B
20 11
10
F
*1
*2
*3
p
Mx
y
1
E
Index mark
D
E
H
b
Z
A
Terminal cross section
( Ni/Pd/Au plating )
p
c
b
1
1
Detail F
L
L
A
θ
NOTE)
1. DIMENSIONS"*1 (Nom)"AND"*2"
DO NOT INCLUDE MOLD FLASH.
2. DIMENSION"*3"DOES NOT
INCLUDE TRIM OFFSET.
HD74HC244
Rev.2.00 Jan 31, 2006 page 7 of 7
0.935
0.15
1.27
10.00 10.65
0.400.34
p
A
1
13.2
FP-20DBV
RENESAS CodeJEITA Package Code Previous Code
MaxNomMin
Dimension in Millimeters
Symbol
Reference
2.65
1.270.700.40
7.50
0.300.200.10
0.46
0.300.250.20
10.40
8
°
0
°
0.12
1.45
12.80
0.52g
MASS[Typ.]
1
E
1
1
2
L
Z
H
y
x
θ
c
b
A
E
D
b
c
e
e
L
A
P-SOP20-7.5x12.8-1.27 PRSP0020DC-A
1120
10
F
*1
*2
*3
p
Mx
y
1
E
Index mark
E
H
D
Zb
A
Terminal cross section
( Ni/Pd/Au plating )
p
c
b
1
1
Detail F
L
L
A
θ
NOTE)
1. DIMENSIONS"*1 (Nom)"AND"*2"
@ DO NOT INCLUDE MOLD FLASH.
2. DIMENSION"*3"DOES NOT
@ INCLUDE TRIM OFFSET.
NOTE)
1. DIMENSIONS"*1 (Nom)"AND"*2"
DO NOT INCLUDE MOLD FLASH.
2. DIMENSION"*3"DOES NOT
INCLUDE TRIM OFFSET.
Index mark
E
1
y
xM
p
*3
*2
*1
F
10
20 11
A
D
E
H
Zb
Terminal cross section
( Ni/Pd/Au plating )
p
c
b
1
1
Detail F
A
L
L
θ
0.65
0.10
0.65
6.20 6.60
0.200.15
p
A
1
6.80
TTP-20DAV
RENESAS CodeJEITA Package Code Previous Code
MaxNomMin
Dimension in Millimeters
Symbol
Reference
1.10
0.60.50.4
4.40
0.100.070.03
0.25
0.200.150.10
6.40
8
°
0
°
0.13
1.0
6.50
0.07g
MASS[Typ.]
1
E
1
1
2
L
Z
H
y
x
θ
c
b
A
E
D
b
c
e
e
L
A
P-TSSOP20-4.4x6.5-0.65 PTSP0020JB-A
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