Specification	SN74ALS521DWR

Current - Output High, Low [custom]	24 mA
Current - Output High, Low [custom]	2.6 mA
Max Propagation Delay @ V, Max CL	20 ns
Mounting Type	Surface Mount
Number of Bits	8
Operating Temperature [Max]	70 °C
Operating Temperature [Min]	0 °C
Output	Active Low
Output Function	A=B
Package / Case	20-SOIC
Package / Case [y]	0.295 in
Package / Case [y]	7.5 mm
Supplier Device Package	20-SOIC
Type	Identity Comparator
Voltage - Supply [Max]	5.5 V
Voltage - Supply [Min]	4.5 V

SN74ALS521 Series

8-Bit Identity/Magnitude Comparators (P=Q) with Enable

Part	Type	Output Function	Voltage - Supply [Min]	Voltage - Supply [Max]	Mounting Type	Max Propagation Delay @ V, Max CL	Supplier Device Package	Package / Case	Package / Case	Package / Case	Operating Temperature [Max]	Current - Output High, Low [custom]	Current - Output High, Low [custom]	Number of Bits	Output	Package / Case [y]	Package / Case [y]
Texas Instruments SN74ALS521N	Identity Comparator	A=B	4.5 V	5.5 V	Through Hole	20 ns	20-PDIP	20-DIP	7.62 mm	0.3 in	70 °C	24 mA	2.6 mA	8	Active Low
Texas Instruments SN74ALS521DWRE4	Identity Comparator	A=B	4.5 V	5.5 V	Surface Mount	20 ns	20-SOIC	20-SOIC			70 °C	24 mA	2.6 mA	8	Active Low	0.295 in	7.5 mm
Texas Instruments SN74ALS521NSR	Identity Comparator	A=B	4.5 V	5.5 V	Surface Mount	20 ns	20-SO	20-SOIC	5.3 mm	0.209 "	70 °C	24 mA	2.6 mA	8	Active Low
Texas Instruments SN74ALS521DWR	Identity Comparator	A=B	4.5 V	5.5 V	Surface Mount	20 ns	20-SOIC	20-SOIC			70 °C	24 mA	2.6 mA	8	Active Low	0.295 in	7.5 mm

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 1.94
		10	$ 1.75
		25	$ 1.65
		100	$ 1.40
		250	$ 1.32
		500	$ 1.15
		1000	$ 0.95
	Digi-Reel®	1	$ 1.94
		10	$ 1.75
		25	$ 1.65
		100	$ 1.40
		250	$ 1.32
		500	$ 1.15
		1000	$ 0.95
	Tape & Reel (TR)	2000	$ 0.89
		6000	$ 0.86
		10000	$ 0.82
Texas Instruments	LARGE T&R	1	$ 1.68
		100	$ 1.39
		250	$ 1.00
		1000	$ 0.75

Description

General part information

SN74ALS521 Series

These identity comparators perform comparisons on two 8-bit binary or BCD words. The SN74ALS518 provides P = Q outputs, while the ´ALS520 and SN74ALS521 provide P = Q\ outputs. The SN74ALS518 has an open-collector output. The SN74ALS518 and ´ALS520 feature 20-k pullup resistors on the Q inputs for analog or switch data.

The SN54ALS520 is characterized for operation over the full military temperature range of -55°C to 125°C. The SN74ALS518, SN74ALS520, and SN74ALS521 are characterized for operation from 0°C to 70°C.

Documents

Technical documentation and resources

8-Bit Identity Comparators datasheet (Rev. B)

Data sheet