DM74LS279N

DM74LS279N Datasheet

DM74LS279 Quad S-R Latch

Part	Datasheet
DM74LS279N	DM74LS279N (pdf)

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DM74LS279 Quad S-R Latch DM74LS279 Quad S-R Latch The DM74LS279 consists of four individual and independent Set-Reset Latches with active low inputs. Two of the four latches have an additional S input ANDed with the primary S input. A LOW on any S input while the R input is HIGH will be stored in the latch and appear on the corresponding Q output as a HIGH. A LOW on the R input while the S input is HIGH will clear the Q output to a LOW. Simultaneous transition of the R and S inputs from LOW-toHIGH will cause the Q output to be indeterminate. Both inputs are voltage level triggered and are not affected by transition time of the input data. Ordering Code: Order Number Package Number Package Description DM74LS279M M16A 16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow DM74LS279N N16E 16-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 Inputs Output S Note 1 H Note 2 H = HIGH Level L = LOW Level Q0 = The Level of Q before the indicated input conditions were established. Note 1 For latches with double S inputs: H = both S inputs HIGH L = one or both S inputs LOW Note 2 This output level is pseudo stable that is, it may not persist when the S and R inputs return to their inactive HIGH level. 2000 Fairchild Semiconductor Corporation DS006420 DM74LS279 Absolute Maximum Ratings Note 3 Supply Voltage Input Voltage Operating Free Air Temperature Range 0°C to +70°C Storage Temperature Range −65°C to +150°C Note 3 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 operating free air temperature range unless otherwise noted Parameter Conditions Input Clamp Voltage VCC = Min, II = −18 mA HIGH Level Output Voltage VCC = Min, IOH = Max VIL = Max, VIH = Min LOW Level VCC = Min, IOL = Max Output Voltage VIL = Max, VIH = Min IOL = 4 mA, VCC = Min Input Current Max Input Voltage VCC = Max, VI = 7V

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DM74LS279 Quad S-R Latch

DM74LS279

Quad S-R Latch

The DM74LS279 consists of four individual and independent Set-Reset Latches with active low inputs. Two of the four latches have an additional S input ANDed with the primary S input. A LOW on any S input while the R input is HIGH will be stored in the latch and appear on the corresponding Q output as a HIGH. A LOW on the R input while the S input is HIGH will clear the Q output to a LOW. Simultaneous transition of the R and S inputs from LOW-toHIGH will cause the Q output to be indeterminate. Both inputs are voltage level triggered and are not affected by transition time of the input data.
Ordering Code:

Order Number Package Number

Package Description

DM74LS279M

M16A
16-Lead Small Outline Integrated Circuit SOIC , JEDEC MS-012, Narrow

DM74LS279N

N16E
16-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

Inputs

Output

S Note 1

H Note 2

H = HIGH Level L = LOW Level Q0 = The Level of Q before the indicated input conditions were established.

Note 1 For latches with double S inputs:

H = both S inputs HIGH

L = one or both S inputs LOW

Note 2 This output level is pseudo stable that is, it may not persist when the S and R inputs return to their inactive HIGH level.
2000 Fairchild Semiconductor Corporation DS006420

DM74LS279

Absolute Maximum Ratings Note 3

Supply Voltage

Input Voltage

Operating Free Air Temperature Range 0°C to +70°C

Storage Temperature Range
−65°C to +150°C

Note 3 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 operating free air temperature range unless otherwise noted

Parameter

Conditions

Input Clamp Voltage

VCC = Min, II = −18 mA

HIGH Level

Output Voltage

VCC = Min, IOH = Max

VIL = Max, VIH = Min

LOW Level

VCC = Min, IOL = Max

Output Voltage

VIL = Max, VIH = Min

IOL = 4 mA, VCC = Min

Input Current Max Input Voltage

VCC = Max, VI = 7V

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Datasheet ID: DM74LS279N 513791