DM74AS280M

DM74AS280M Datasheet

DM74AS280 9-Bit Parity Generator/Checker

Part	Datasheet
DM74AS280M	DM74AS280M (pdf)

Related Parts	Information
DM74AS280N	DM74AS280N
DM74AS280MX	DM74AS280MX

PDF Datasheet Preview
DM74AS280 9-Bit Parity Generator/Checker DM74AS280 9-Bit Parity Generator/Checker 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 easily expanded by cascading. The DM74AS280 can be used to upgrade the performance of most systems utilizing the ’180 parity generator/checker. Although the DM74AS280 is implemented without expander inputs, the corresponding function is provided by the availability of an input at pin 4 and no internal connection at pin This permits the DM74AS280 to be substituted for the ’180 in existing designs to produce identical function even if DM74AS280s are mixed with existing ’180s. 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 Advanced oxide-isolated, ion-implanted Schottky TTL process s Switching specifications at 50 pF s Switching specifications guaranteed over full temperature and VCC range Ordering Code: Order Number Package Number Package Description DM74AS280M M14A 14-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow DM74AS280N N14A 14-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, 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 A thru I that are HIGH 0, 2, 4, 6, 8 1, 3, 5, 7, 9 L = LOW State H = HIGH State Outputs 2000 Fairchild Semiconductor Corporation DS006303 DM74AS280 Logic Diagram DM74AS280 Absolute Maximum Ratings Note 1 Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range Typical N Package M Package 7V 0°C to +70°C −65°C to +150°C 77.0°C/W 108.0°C/W 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 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 Free-Air Operating Temperature Electrical Characteristics Over recommended free-air temperature range. All typical values are measured at VCC = 5V, TA = 25°C. Parameter Conditions Input Clamp Voltage HIGH Level Output Voltage LOW Level Output Voltage Input Current Max Input Voltage HIGH Level Input Current LOW Level Input Current Output Drive Current Supply Current VCC = 4.5V, II = −18 mA IOH = −2 mA, VCC = 4.5V to 5.5V VCC = 4.5V, IOL = Max VCC = 5.5V, VIH = 7V VCC = 5.5V, VIH = 2.7V VCC = 5.5V, VIL = 0.4V VCC = 5.5V, VO = 2.25V VCC = 5.5V VCC − 2 −30 Switching Characteristics over recommended operating free air temperature range Parameter Conditions tPLH Propagation Delay Time, VCC = 4.5V to 5.5V, LOW-to-HIGH Level Output

PDF Datasheet Preview

DM74AS280 9-Bit Parity Generator/Checker

DM74AS280 9-Bit Parity Generator/Checker

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 easily expanded by cascading.

The DM74AS280 can be used to upgrade the performance of most systems utilizing the ’180 parity generator/checker. Although the DM74AS280 is implemented without expander inputs, the corresponding function is provided by the availability of an input at pin 4 and no internal connection at pin This permits the DM74AS280 to be substituted for the ’180 in existing designs to produce identical function even if DM74AS280s are mixed with existing ’180s.
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 Advanced oxide-isolated, ion-implanted Schottky

TTL process s Switching specifications at 50 pF s Switching specifications guaranteed over full
temperature and VCC range
Ordering Code:

Order Number Package Number

Package Description

DM74AS280M

M14A
14-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow

DM74AS280N

N14A
14-Lead Plastic Dual-In-Line Package PDIP , JEDEC MS-001, 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 A thru I that are HIGH 0, 2, 4, 6, 8 1, 3, 5, 7, 9

L = LOW State H = HIGH State

Outputs
2000 Fairchild Semiconductor Corporation DS006303

DM74AS280

Logic Diagram

DM74AS280

Absolute Maximum Ratings Note 1

Supply Voltage Input Voltage Operating Free Air Temperature Range Storage Temperature Range Typical

N Package M Package
7V 0°C to +70°C −65°C to +150°C
77.0°C/W 108.0°C/W

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

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 Free-Air Operating Temperature

Electrical Characteristics

Over recommended free-air temperature range. All typical values are measured at VCC = 5V, TA = 25°C.

Parameter

Conditions

Input Clamp Voltage

HIGH Level Output Voltage

LOW Level Output Voltage

Input Current Max Input Voltage

HIGH Level Input Current

LOW Level Input Current

Output Drive Current

Supply Current

VCC = 4.5V, II = −18 mA IOH = −2 mA, VCC = 4.5V to 5.5V VCC = 4.5V, IOL = Max VCC = 5.5V, VIH = 7V VCC = 5.5V, VIH = 2.7V VCC = 5.5V, VIL = 0.4V VCC = 5.5V, VO = 2.25V VCC = 5.5V

VCC − 2 −30

Switching Characteristics
over recommended operating free air temperature range

Parameter

Conditions
tPLH

Propagation Delay Time,

VCC = 4.5V to 5.5V,

LOW-to-HIGH Level Output

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Datasheet ID: DM74AS280M 513727