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74LS503 PDF даташит

Спецификация 74LS503 изготовлена ​​​​«Fairchild Semiconductor» и имеет функцию, называемую «8-Bit Successive Approximation Register».

Детали детали

Номер произв 74LS503
Описание 8-Bit Successive Approximation Register
Производители Fairchild Semiconductor
логотип Fairchild Semiconductor логотип 

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74LS503 Даташит, Описание, Даташиты
March 1989
Revised March 2000
DM74LS503
8-Bit Successive Approximation Register
(with Expansion Control)
General Description
The DM74LS503 register has an active LOW Enable (E)
input that is used in cascading two or more packages for
longer word lengths. A HIGH signal on E, after a START
operation, forces Q7 HIGH and prevents the device from
accepting serial data. With the E input of an DM74LS503
connected to the CC output of a preceding (more signifi-
cant) device, the DM74LS503 will be inhibited until the pre-
ceding device is filled, causing its CC output to go LOW.
This LOW signal then enables the DM74LS503 to accept
the serial data on subsequent clocks.
Features
Performs serial-to-parallel conversion
Expansion control for longer words
Storage and control for successive approximation A to D
conversion
Low power Schottky version of 2503
Ordering Code:
Order Number Package Number
Package Description
DM74LS503N
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Connection Diagram
Logic Symbol
VCC = Pin 16
GND = Pin 8
Pin Descriptions
Pin Names
D
S
CP
E
CC
Q0–Q7
Q7
Description
Serial Data Input
Start Input (Active LOW)
Clock Pulse Input (Active Rising Edge)
Conversion Enable Input (Active LOW)
Conversion Complete Output (Active LOW)
Parallel Register Outputs
Complement of Q7 Output
© 2000 Fairchild Semiconductor Corporation DS010190
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74LS503 Даташит, Описание, Даташиты
Logic Diagrams
Note: Cell logic is repeated for register stages Q5 to Q1.
Connection for Longer Word Lengths
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74LS503 Даташит, Описание, Даташиты
Absolute Maximum Ratings(Note 1)
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range
65°C to +150°C
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
IOH
IOL
TA
tS (H)
tS (L)
tH (H)
tH (L)
tS (H)
tS (L)
tH (H)
tH (L)
tW (H)
tW (L)
Parameter
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
LOW Level Output Current
Free Air Operating Temperature
Setup Time HIGH or LOW
S to CP
Hold Time HIGH or LOW
S to CP
Setup Time HIGH or LOW
D to CP
Hold Time HIGH or LOW
D to CP
CP Pulse Width HIGH or LOW
Min
4.75
2
0
16
16
0
0
8
8
10
10
46
46
Nom
5
Max
5.25
0.8
0.4
8
70
Electrical Characteristics
Over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
Min
VI Input Clamp Voltage
VCC = Min, II = 18 mA
VOH HIGH Level
Output Voltage
VCC = Min, IOH = Max,
VIL = Max
2.7
VOL LOW Level
VCC = Min, IOL = Max, VIH = Min
Output Voltage
IOL = 4 mA, VCC = Min
II Input Current @ Max
VCC = Max, VI = 7V
Input Voltage
VI = 10V
IIH HIGH Level Input Current
VCC = Max, VI = 2.7V
IIL LOW Level Input Current
VCC = Max, VI = 0.4V
IOS Short Circuit Output Current
VCC = Max (Note 3)
20
ICC Supply Current
VCC = Max
Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Typ
(Note 2)
Switching Characteristics
VCC = +5.0V, TA = +25°C
Symbol
Parameter
fMAX
tPLH
tPHL
tPLH
tPHL
Maximum Count Frequency
Propagation Delay
CP to Qn or CC
Propagation Delay
E to Q7
RL = 2 k, CL = 15 pF
Min Max
15
35
25
20
24
Max
1.5
0.5
0.4
0.1
20
0.8
100
65
Units
V
V
V
mA
mA
°C
ns
ns
ns
ns
ns
Units
V
V
V
mA
µA
mA
mA
mA
Units
MHz
ns
ns
3 www.fairchildsemi.com










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