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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 RBI D Inputs A GND
1 2 3 4 5 6 7 8 B C LT BI/RBO RBI D A f g a b c d e
16 15 14 13 12 11 10 9
VCC f g a b c d e Outputs
(Top view)
Rev.3.00, Jul.22.2005, page 1 of 6
HD74LS48
Function Table
Decimal or Function 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 BI RBI LT Inputs LT H H H H H H H H H H H H H H H H X H L RBI H X X X X X X X X X X X X X X X X L X D L L L L L L L L H H H H H H H H X L X C L L L L H H H H L L L L H H H H X L X B L L H H L L H H L L H H L L H H X L X A L H L H L H L H L H L H L H L H X L X BI / RBO H H H H H H H H H H H H H H H H L L H Outputs a H L H H L H L H H H L L L H L L L L H b H H H H H L L H H H L L H L L L L L H c H H L H H H H H H H L H L L L L L L H d H L H H L H H L H L H H L H H L L L H e H L H L L L H L H L H L L L H L L L H f H L L L H H H L H H L L H H H L L L H g L L H H H H H L H H H H H H H L L L H 2 3 4 1 Note
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 e d g b c
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
HD74LS48
Block Diagram
a A
B
b
Inputs C c
D d
Outputs
Blanking Input or Ripple Blanking Output (BI/RBO)
e
f
Lamp Test (LT) Inputs Ripple Blanking (RBI) g
Absolute Maximum Ratings
Item Supply voltage Input voltage Power dissipation Symbol VCC VIN PT Ratings 7 7 400 Unit V V mW C
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 A A mA mA C
Rev.3.00, Jul.22.2005, page 3 of 6
HD74LS48
Electrical Characteristics
(Ta = -20 to +75 C)
Item Input voltage a to g BI / RBO Output voltage a to g VOL BI / RBO Output current** a to g except BI / RBO Input current BI / RBO except BI / RBO IO IIH IIL II IOS ICC Symbol VIH VIL VOH min. 2.0 -- 2.4 2.4 -- -- -- -- -1.3 -- -- -- -- -0.3 -- typ.* -- -- -- -- -- -- -- -- -- -- -- -- -- -- 25 max. -- 0.8 -- -- 0.4 0.5 0.4 0.5 -- 20 -0.4 -1.2 0.1 -2 38 Unit V V V V V V mA A mA mA mA mA mA V Condition
IOH = -100 A IOH = -50 A IOL = 2 mA IOL = 6 mA IOL = 1.6 mA
VCC = 4.75 V, VIH = 2 V, VIL = 0.8 V VCC = 4.75 V, 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 VCC = 5.25 V VCC = 5.25 V VCC = 4.75 V, IIN = -18 mA
Short-circuit BI / RBO output current Supply current***
Input clamp voltage VIK -- -- -1.5 Notes: * VCC = 5 V, Ta = 25C ** Input condition as for VOH *** ICC is measured with all outputs open and inputs at 4.5 V.
Switching Characteristics
(VCC = 5 V, Ta = 25C)
Item Turn-on time Turn-off time Symbol tPHL tPLH tPHL tPLH Input A RBI min. -- -- -- -- typ. -- -- -- -- max. 100 100 100 100 Unit ns ns Condition CL = 15 pF, RL = 4 k CL = 15 pF, RL = 6 k
Rev.3.00, Jul.22.2005, page 4 of 6
HD74LS48
Testing Method
Test Circuit
4.5V VCC
RL a Output A B C D LT RBI BI/RBO
See Testing Table
Input P.G. Zout = 50
b c d e f g
CL
Waveform
tTLH 90% 1.3 V 10% tPLH tTHL 90% 1.3 V 10% tPHL 3V 0V
Input
VOH In phase output tPHL 1.3 V tPLH VOH Out of phase output 1.3 V 1.3 V VOL 1.3 V VOL
Testing Table
Item Inputs RBI 4.5 V 4.5 V 4.5 V IN D GND GND GND GND C GND GND 4.5 V GND B GND 4.5 V 4.5 V GND A IN IN IN GND a OUT -- OUT OUT b -- -- OUT OUT c -- OUT -- OUT Outputs d OUT -- OUT OUT e OUT OUT OUT OUT f OUT -- OUT OUT g -- -- OUT --
tPLH tPHL
Rev.3.00, Jul.22.2005, page 5 of 6
HD74LS48
Package Dimensions
JEITA Package Code P-DIP16-6.3x19.2-2.54 RENESAS Code PRDP0016AE-B Previous Code DP-16FV MASS[Typ.] 1.05g
D
16
9
1 0.89 b3
8
Z
E
A1
A
Reference Symbol
Dimension in Millimeters Min Nom 7.62 19.2 6.3 20.32 7.4 5.06 0.51 0.40 0.48 1.30 0.19 0 2.29 2.54 0.25 0.31 15 2.79 1.12 2.54 0.56 Max
e D E
1
L
A A1
e
bp
e1
b c b c
p 3
e Z ( Ni/Pd/Au plating ) L
Rev.3.00, Jul.22.2005, page 6 of 6
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