I/O Port. DM74AS286 Datasheet

DM74AS286 Port. Datasheet pdf. Equivalent

Part DM74AS286
Description 9-Bit Parity Generator/Checker with Bus-Driver Parity I/O Port
Feature DM74AS286 9-Bit Parity Generator/Checker with Bus-Driver Parity I/O Port October 1986 Revised April.
Manufacture Fairchild Semiconductor
Datasheet
Download DM74AS286 Datasheet

DM74AS286 9-Bit Parity Generator/Checker with Bus-Driver Par DM74AS286 Datasheet
Recommendation Recommendation Datasheet DM74AS286 Datasheet





DM74AS286
October 1986
Revised April 2000
DM74AS286
9-Bit Parity Generator/Checker
with Bus-Driver Parity I/O Port
General Description
These universal, 9-bit parity generators/checkers utilize
advanced Schottky high performance circuitry and feature
odd/even outputs to facilitate operation of either odd or
even parity applications. The word length capability is eas-
ily expanded by cascading.
The DM74AS286 can be used to upgrade the performance
of most systems utilizing the DM74AS280 parity generator/
checker. Although the DM74AS286 is implemented without
expander inputs, the corresponding function is provided by
the availability of an input pin XMIT. XMIT is a control line
which makes parity error output active and parity an input
port when HIGH; when LOW, parity error output is inactive
and parity becomes an output port. In addition, parity I/O
control circuitry contains a feature to keep the I/O port in
the 3-STATE during power UP or DOWN to prevent bus
glitches.
Features
s PNP inputs to reduce bus loading
s Generates either odd or even parity for nine data lines
s Inputs are buffered to lower the drive requirements
s Can be used to upgrade existing systems using MSI
parity circuits
s Cascadable for n-bits
s Switching specifications at 50 pF
s Switching specifications guaranteed over full
temperature and VCC range
s A parity I/O portable to drive bus
Ordering Code:
Order Number Package Number
Package Description
DM74AS286M
M14A
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
DM74AS286N
N14A
14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram
Function Table
Number of Inputs Parity I/O
Parity Mode
(A thru I)
XMIT Error
of
that are HIGH Input Output
Operation
0, 2, 4, 6, 8
N/A H
LH
Parity
1, 3, 5, 7, 9
N/A L
L H Generator
0, 2, 4, 6, 8
H N/A H H
Parity
0, 2, 4, 6, 8
L N/A H
L Checker
1, 3, 5, 7, 9
H N/A H
L
Parity
1, 3, 5, 7, 9
L N/A H H Checker
L = LOW Logic Level
H = HIGH Logic Level
N/A = Not Applicable
© 2000 Fairchild Semiconductor Corporation DS006305
www.fairchildsemi.com



DM74AS286
Absolute Maximum Ratings(Note 1)
Supply Voltage
Input Voltage
Operating Free Air Temperature Range
Storage Temperature Range
Typical θJA
N Package
M Package
7V
7V
0°C to +70°C
65°C to +150°C
77.0°C/W
108.0°C/W
Note 1: The Absolute Maximum Ratingsare 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 Conditionstable will define the conditions
for actual device operation.
Recommended Operating Conditions
Symbol
VCC
VIH
VIL
IOH
IOL
TA
Parameter
Supply Voltage
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Current
LOW Level Output Current
Operating Free-Air Temperature
Parity I/O
Parity Error
Parity I/O
Parity Error
Min
4.5
2
0
Typ
5
Electrical Characteristics
over recommended free-air temperature range. All typical values are measured at VCC = 5V, TA = 25°C.
Symbol
Parameter
Conditions
Min
VIK Input Clamp Voltage
VCC = 4.5V, IIN = −18 mA
VOH HIGH Level
IOH = Max, VCC = 4.5V
2.4
Output Voltage
VCC = 4.5V to 5.5V, IOH = −2 mA
VCC 2
VOL
LOW Level Output Voltage
VCC = 4.5V, IOL = Max
II
Input Current at Maximum
VCC = 5.5V, VIH = 7V
Input Voltage
(VI = 5.5V for Parity I/O)
IIH
HIGH Level Input Current
VCC = 5.5V
Others
VIH = 2.7V (Note 2)
Parity I/O
IIL
LOW Level Input Current
VCC = 5.5V, VIL = 0.4V (Note 2)
IO Output Drive Current
VCC = 5.5V, VOUT = 2.25V
30
ICC Supply Current
VCC = 5.5V, Transmit Mode
XMIT = LOW
Receive Mode
XMIT = HIGH
Note 2: For I/O ports, the parameters IIH and IIL include the OFF-state current, IOZH and IOZL.
Max
5.5
0.8
15
2
48
20
70
Units
V
V
V
mA
mA
mA
mA
°C
Typ
3.2
0.35
Max
1.2
0.5
0.1
20
50
0.5
112
43
Units
V
V
V
V
mA
µA
mA
mA
mA
50 mA
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