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HCT251, HCT257, HCT258

Table of contents:
Info of HCT251
Info of HCT257
Info of HCT258

HCT251, HCT257, HCT258 Selling Leads, Datasheet

MFG:HARess Package Cooled:SOP16S D/C:2007+

HCT251, HCT257, HCT258 Datasheet download

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Part Number: HCT251

MFG: HARess

Package Cooled: SOP16S

D/C: 2007+

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HCT251 General Description

The 74HC/HCT251 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL). They are specified in compliance with JEDEC standard no. 7A.

The 74HC/HCT251 are the logic implementations of single-pole 8-position switches with the state of three select inputs (S₀, S₁, S₂) controlling the switch positions. Assertion (Y) and negation (Y) outputs are both provided. The output enable input (OE) is active LOW. The logic function provided at the output, when activated, is:

Y = OE.(I₀.S₀. S₁.S ₂ + I1.S0.S ₁.S ₂ + + I₂.S ₀.S₁.S ₂ + I₃.S₀.S₁.S ₂ + + I₄.S ₀.S ₁.S₂ + I₅.S₀.S ₁.S₂+ + I₆.S ₀.S₁.S₂ + I₇.S₀.S₁.S₂)

Both outputs are in the high impedance OFF-state (Z) when the output enable input is HIGH, allowing multiplexer expansion by tying the outputs.

HCT251 Features

· True and complement outputs
· Both outputs are 3-state for further multiplexer expansion
· Multifunction capability
· Permits multiplexing from n-lines to one line
· Output capability: standard
· I_CC category: MSI

HCT251 Connection Diagram

HCT257 General Description

The 74HC/HCT4053 are high-speed Si-gate CMOS devices and are pin compatible with the "4053" of the "4000B" series. They are specified in compliance with JEDEC standard no. 7A.

The 74HC/HCT4053 are triple 2-channel analog multiplexers/demultiplexers with a common enable input (E). Each multiplexer/demultiplexer has two independent inputs/outputs (nY0 and nY1), a common input/output (nZ) and three digital select inputs (S1 to S3).

With E LOW, one of the two switches is selected (low impedance ON-state) by S1 to S3. With E HIGH, all switches are in the high impedance OFF-state, independent of S1 to S3.

V_CC and GND are the supply voltage pins for the digital control inputs (S₁, to S₃, and E). The V_CC to GND ranges are 2.0 to 10.0 V for HC and 4.5 to 5.5 V for HCT. The analog inputs/outputs (nY0 and nY1, and nZ) can swing between VCC as a positive limit and VEE as a negative limit.V_CC - V_EE may not exceed 10.0 V.

For operation as a digital multiplexer/demultiplexer, V_EE is connected to GND (typically ground).

HCT257 Maximum Ratings

SYMBOL	PARAMETER	MIN.	MAX.	UNIT	CONDITIONS
V_CC	DC supply voltage	-0.5	+11.0	V
±I_IK	DC digital input diode current		20	mA	for V_I < -0.5 V or V_I > V_CC+ 0.5 V
±I_SK	DC switch diode current		20	mA	for V_S< -0.5 V or V_S> V_CC+ 0.5 V
±I_S	DC switch current		25	mA	for -0.5 V < V_S< V_CC + 0.5 V
±I_EE	DC VEE current		20	mA
±I_CC; ±I_GND	DC VCC or GND current		50	mA
T_stg	storage temperature range	-65	+150	°C
P_tot	power dissipation per package plastic DIL		750	mW	for temperature range: -40 to + 125 °C 74HC/HCT above + 70 °C: derate linearly with 12 mW/K
	plastic mini-pack (SO)		500	mW	above + 70 °C: derate linearly with 8 mW/K
P_S	power dissipation per switch		100	mW

HCT257 Features

` Low "ON" resistance:
80 (typ.) at V_CC - V_EE= 4.5 V
70 (typ.) at V_CC- V_EE = 6.0 V
60 (typ.) at V_CC - V_EE= 9.0 V
` Logic level translation:
to enable 5 V logic to communicate
with ± 5 V analog signals
` Typical "break before make" built in
` Output capability: non-standard
` I_CC category: MSI

HCT257 Typical Application

· Analog multiplexing and demultiplexing
· Digital multiplexing and demultiplexing
· Signal gating

HCT257 Connection Diagram

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