HD74LS48 Datasheet PDF - Renesas


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HD74LS48
Renesas

Part Number HD74LS48
Description BCD-to-Seven-Segment Decoder / Driver
Page 7 Pages

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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 above 9 are unique symbols to authenticate input
conditions. This circuit incorporates automatic leading and / or trailing-edge zero-blanking control (RBI and RBO).
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 pulsing or to inhibit the outputs.
Inputs and outputs are entirely compatible for use with TTL or DTL logic outputs.
Features
Ordering Information
Part Name
HD74LS48P
Package Type
DILP-16 pin
Package Code
(Previous Code)
PRDP0016AE-B
(DP-16FV)
Package
Abbreviation
P
Taping Abbreviation
(Quantity)
Pin Arrangement
B
Inputs
C
Lamp
Test
BI/RBO
1
2
3
4
RBI 5
D6
Inputs
A7
GND 8
B
C
LT
BI/RBO
RBI
D
A
f
g
a
b
c
d
e
16 VCC
15 f
14 g
13 a
12 b Outputs
11 c
10 d
9e
(Top view)
Rev.3.00, Jul.22.2005, page 1 of 6



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HD74LS48
Function Table
Decimal or
Inputs
BI /
Outputs
Function LT RBI D C B A RBO a
b
c
d
e
f
Note
g
0
H H LLLL
H
HHHHHH L
1
H X LLLH
H
LHHL L L L
2
H X LLHL
H
HHLHHL H
3
H X L LHH
H
HHHHL L H
4
H X LHLL
H
LHHL LHH
5
H X LHLH
H
H L HH L HH
6
H X LHHL
H
L LHHHHH
7
H X LHHH
H
HHHL L L L
1
8
H X HLLL
H
HHHHHHH
9
H X HLLH
H
HHHL LHH
10
H X HLHL
H
L L LHHLH
11
H X HLHH
H
L LHHL L H
12
H X HHL L
H
LHL L LHH
13
H X HHLH
H
HL LHLHH
14
H X HHHL
H
L L LHHHH
15
H X HHHH
H
LLLLLLL
BI
X X XXXX
L
LLLL
LLL
2
RBI
H L LLLL
L
LLLL
LLL
3
LT
L X XXXX
H
HHHHHHH
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
f gb
ec
d 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Rev.3.00, Jul.22.2005, page 2 of 6



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HD74LS48
Block Diagram
A
B
Inputs
C
a
b
c
D
Blanking Input or
Ripple Blanking
Output (BI/RBO)
Outputs
d
e
Lamp Test (LT)
Inputs
Ripple Blanking (RBI)
f
g
Absolute Maximum Ratings
Item
Symbol
Ratings
Supply voltage
VCC
7
Input voltage
VIN 7
Power dissipation
PT 400
Storage temperature
Tstg –65 to +150
Note: Voltage value, unless otherwise noted, are with respect to network ground terminal.
Recommended Operating Conditions
Item
Supply voltage
Output current
Output current
Operating temperature
Symbol
VCC
IOH (a to g)
IOH (BI/RBO)
IOL (a to g)
IOL (BI/RBO)
Topr
Min
4.75
-20
Typ
5.00
25
Max
5.25
–100
–50
6
3.2
75
Unit
V
V
mW
°C
Unit
V
µA
µA
mA
mA
°C
Rev.3.00, Jul.22.2005, page 3 of 6



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HD74LS48
Electrical Characteristics
Item
Symbol min. typ.* max.
Input voltage
VIH
2.0 —
VIL — — 0.8
a to g
BI / RBO
VOH
2.4 —
2.4 —
Output voltage a to g
BI / RBO
VOL
— — 0.4
— — 0.5
— — 0.4
— — 0.5
Output current** a to g
IO
–1.3 —
Input current
except BI
/ RBO
BI / RBO
IIH
IIL
— — 20
— — –0.4
— — –1.2
except BI
/ RBO
II
— — 0.1
Short-circuit
output current
BI / RBO
IOS
–0.3 —
–2
Supply current***
ICC — 25 38
Input clamp voltage
Notes: * VCC = 5 V, Ta = 25°C
VIK
— — –1.5
** Input condition as for VOH
*** ICC is measured with all outputs open and inputs at 4.5 V.
Unit
V
V
V
V
V
V
mA
µA
mA
mA
mA
(Ta = –20 to +75 °C)
Condition
IOH = –100 µA VCC = 4.75 V,
IOH = –50 µA VIH = 2 V, VIL = 0.8 V
IOL = 2 mA
IOL = 6 mA
VCC = 4.75 V,
IOL = 1.6 mA VIH = 2 V, VIL = 0.8 V
IOL = 3.2 mA
VCC = 4.75 V, VO = 0.85 V,
VCC = 5.25 V, VI = 2.7 V
VCC = 5.25 V, VI = 0.4 V
VCC = 5.25 V, VI = 0.4 V
VCC = 5.25 V, VI = 7 V
mA VCC = 5.25 V
mA VCC = 5.25 V
V VCC = 4.75 V, IIN = –18 mA
Switching Characteristics
Item
Turn-on time
Turn-off time
(VCC = 5 V, Ta = 25°C)
Symbol Input min.
typ.
max.
Unit
Condition
tPHL
tPLH
A
— 100
— 100 ns CL = 15 pF, RL = 4 k
tPHL RBI
tPLH
— 100
— 100 ns CL = 15 pF, RL = 6 k
Rev.3.00, Jul.22.2005, page 4 of 6




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