Rev.3.00, Jul.22.2005, page 1 of 6
HD74LS48
BCD-to-Seven-Segment Decoder / Driver (Internal Pull-up outputs)
REJ03D0411–0300
Rev.3.00
Jul.22.2005
HD74LS48 features active high outputs for driving lamp buffers. This circuit has full ripple blanking input / output
controls and a lamp test input. Display patterns for BCD input counts abo ve 9 are uniq ue s ymbols to authenticate inp ut
conditions. This circuit incorp orates automatic leading and / or trailing-edge zero-blanking control (RBI and RB O).
Lamp test (LT) of these types may be performed at any time when the BI / RBO node is at a high level. It contains an
overriding blanking input (BI) which can be used to control the lamp intensity be pulsin g or to inhibit the outputs.
Inputs and outputs are entirely compatible for use with TTL or DTL logic outputs.
Features
• Orderi ng Info rmati on
Part Name Package Type Package Code
(Previous Code) Package
Abbreviation Taping Abbreviation
(Quantity)
HD74LS48P DILP-16 pin PRDP0016AE-B
(DP-16FV) P —
Pin Arrangement
(Top view)
V
CC
GND
B
C
Lamp
Test
BI/RBO
RBI
D
A
f
g
b
a
c
d
e
15
161
2
3
4
5
6
7
14
89
10
11
12
13
Outputs
Inputs
Inputs
B
C
D
A
RBI
BI/RBO
LT
f
g
d
e
c
b
a
HD74LS48
Rev.3.00, Jul.22.2005, page 2 of 6
Function Table
Inputs Outputs Decimal or
Function LT RBI D C B A BI /
RBO a b c d e f g
Note
0 H H L L L L H H H H H H H L
1 H X L L L H H L H H L L L L
2 H X L L H L H H H L H H L H
3 H X L L H H H H H H H L L H
4 H X L H L L H L H H L L H H
5 H X L H L H H H L H H L H H
6 H X L H H L H L L H H H H H
7 H X L H H H H H H H L L L L
8 H X H L L L H H H H H H H H
9 H X H L L H H H H H L L H H
10 H X H L H L H L L L H H L H
11 H X H L H H H L L H H L L H
12 H X H H L L H L H L L L H H
13 H X H H L H H H L L H L H H
14 H X H H H L H L L L H H H H
15 H X H H H H H L L L L L L L
1
BI X X X X X X L L L L L L L L 2
RBI H L L L L L L L L L L L L L 3
LT L X X X X X H H H H H H H H 4
H; high level, L; low level, X, irrelevant
Notes: 1. The blanking input (BI) must be open or held at a high logic level when output functions 0 through 15 are
desired.
2. When a low logic level is applied directly to the blanking input (BI), all segment outputs are low regardless of
the level of any other input.
3. When ripple-blanking input (RBI) and inputs A, B, C, and D are at a low level with the lamp-test input high, all
segment outputs go low and the ripple-blanking output (RBO) goes to a low level (response condition).
4. When a blanking input / ripple blanking output (BI / RBO) is open or held high and a low is applied to the
lamp-test input, all segment outputs are high.
a
543210 6 7 8 9 101112131415
b
d
c
f
e
g
HD74LS48
Rev.3.00, Jul.22.2005, page 3 of 6
Block Diagram
Blanking Input or
Ripple Blanking
Output (BI/RBO)
Lamp Test (LT)
Ripple Blanking (RBI)
Outputs
Inputs
A
B
C
D
Inputs
a
b
c
d
e
f
g
Absolute Maximum Ratings
Item Symbol Ratings Unit
Supply voltage VCC 7 V
Input voltage VIN 7 V
Power dissipation PT 400 mW
Storage temperature Tstg –65 to +150 °C
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item Symbol Min Typ Max Unit
Supply voltage VCC 4.75 5.00 5.25 V
IOH (a to g) — — –100 µA
Output current IOH (BI/RBO) — — –50 µA
IOL (a to g) — — 6 mA
Output current IOL (BI/RBO) — — 3.2 mA
Operating temperature Topr -20 25 75 °C
HD74LS48
Rev.3.00, Jul.22.2005, page 4 of 6
Electrical Characteristics
(Ta = –20 to +75 °C)
Item Symbol min. typ.* max. Unit Condition
VIH 2.0 — — V
Input voltage VIL — — 0.8 V
a to g 2.4 — — V IOH = –100 µA
BI / RBO VOH 2.4 — — V IOH = –50 µA VCC = 4.75 V,
VIH = 2 V, VIL = 0.8 V
— — 0.4 IOL = 2 mA
a to g — — 0.5 V IOL = 6 mA
— — 0.4 IOL = 1.6 mA
Output voltage
BI / RBO VOL
— — 0.5 V IOL = 3.2 mA
VCC = 4.75 V,
VIH = 2 V, VIL = 0.8 V
Output current** a to g IO –1.3 — — mA VCC = 4.75 V, VO = 0.85 V,
IIH — — 20 µA VCC = 5.25 V, VI = 2.7 V
except BI
/ RBO — — –0.4 mA VCC = 5.25 V, VI = 0.4 V
BI / RBO IIL — — –1.2 mA VCC = 5.25 V, VI = 0.4 V
Input current except BI
/ RBO II — — 0.1 mA VCC = 5.25 V, VI = 7 V
Short-circuit
output current BI / RBO IOS –0.3 — –2 mA VCC = 5.25 V
Supply current*** ICC — 25 38 mA VCC = 5.25 V
Input clamp voltag e VIK — — –1.5 V VCC = 4.75 V, IIN = –18 mA
Notes: * VCC = 5 V, Ta = 25°C
** Input condition as for VOH
*** ICC is measured with all outputs open and inputs at 4.5 V.
Switching Characteristics
(VCC = 5 V, Ta = 25°C)
Item Symbol Input min. typ. max. Unit Condition
tPHL — — 100
Turn-on time tPLH A — — 100
ns CL = 15 pF, RL = 4 kΩ
tPHL — — 100
Turn-off time tPLH RBI — — 100
ns CL = 15 pF, RL = 6 kΩ
HD74LS48
Rev.3.00, Jul.22.2005, page 5 of 6
Testing Method
Test Circuit
4.5V
A
B
C
D
LT
RBI
BI/RBO
Input
P.G.
Z
out
= 50Ω
See Testing Table
Output
V
CC
a
b
d
c
e
f
g
R
L
C
L
Waveform
tPLH tPHL
VOH
VOL
0 V
3 V
VOH
VOL
tPHL tPLH
10%
90%
1.3 V
1.3 V 1.3 V
1.3 V 1.3 V
1.3 V
10%
90%
Input
In phase output
Out of phase output
tTLH tTHL
Testing Table
Inputs Outputs
Item RBI D C B A a b c d e f g
4.5 V GND GND GND IN OUT — — OUT OUT OUT —
4.5 V GND GND 4.5 V IN — — OUT — OUT — —
4.5 V GND 4.5 V 4.5 V IN OUT OUT — OUT OUT OUT OUT
tPLH
tPHL IN GND GND GND GND OUT OUT OUT OUT OUT OUT —
HD74LS48
Rev.3.00, Jul.22.2005, page 6 of 6
Package Dimensions
7.62
DP-16FV
RENESAS CodeJEITA Package Code Previous Code
MaxNomMin
Dimension in Millimeters
Symbol
Reference
19.2
6.3
5.06
MASS[Typ.]
1.05g
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
°
PRDP0016AE-BP-DIP16-6.3x19.2-2.54
20.32
7.4
0.40 0.48
1.12
2.54
1
p
1
3
1 8
16 9
e
b
A
LA
Z
e c
E
D
b
0.89
θ
( Ni/Pd/Au plating )
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