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SN74LS175N

Quad D flip-flop, edge-triggered, Q+Q̅, common CLK/CLR, PDIP-16

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Pieza del fabricante：

SN74LS175N

Paquete：

PDIP-16 (19.3 x 6.35 x 4.57mm, 2.54mm pitch, through-hole)

Marca：

Categorías de productos：

Circuitos integrados IC, Circuitos integrados de interfaz

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Descripción

Productos

The SN74LS175N from Texas Instruments is a quad D-type flip-flop with complementary outputs, common clock and clear inputs, and edge-triggered operation in a 16-pin PDIP package.

Especificaciones

Number of Flip-Flops	4 (quad D-type)
Logic Family	LS (Low-power Schottky)
Tensión de alimentación	4.75V to 5.25V (5V nominal)
Trigger Type	Positive-edge triggered (rising edge of CLK)
Outputs	True (Q) and complementary (Q̅) per flip-flop
Propagation Delay (CLK to Q)	25ns typical
Maximum Clock Frequency	30MHz typical
Setup Time	15ns minimum before clock edge
Hold Time	0ns minimum after clock edge
Clear (CLR)	Active-low, asynchronous, overrides all
Temperatura de funcionamiento	0°C to +70°C
Paquete	PDIP-16 (19.3 x 6.35mm)

Características

Four D-type edge-triggered flip-flops
Complementary outputs (Q and Q̅)
Common clock input for all four flip-flops
Asynchronous clear (active-low)
30MHz maximum clock frequency
Zero hold time simplifies design

Aplicaciones

Parallel data register
Data synchronization and capture
Address latching
Frequency division
Digital delay elements

Introducción del producto:SN74LS175N Presentación del producto

The SN74LS175N from Texas Instruments contains four D-type positive-edge-triggered flip-flops with a common clock (CLK) and common asynchronous clear (CLR) input. Each flip-flop has both true (Q) and complementary (Q̅) outputs. On the rising edge of CLK, the data at each D input is transferred to the corresponding Q output. The asynchronous CLR input, when LOW, immediately resets all Q outputs to LOW regardless of the clock or D inputs. The complementary outputs are useful for generating both active-HIGH and active-LOW versions of a stored signal without additional inverters. The 30MHz maximum clock frequency and 15ns setup time make it suitable for moderate-speed digital systems. The zero hold time simplifies cascading with other TTL logic. The N suffix denotes the PDIP-16 through-hole package.

Principio de funcionamiento:SN74LS175N Principio de funcionamiento

Each of the four D-type flip-flops in the SN74LS175N captures the logic level at its D input on the rising edge of the common CLK signal. The captured value appears at the Q output, and the inverted value appears at the Q̅ output. Between clock edges, the outputs hold their previous values regardless of changes on the D inputs. The setup time requirement (15ns minimum) means the D input must be stable for at least 15ns before the clock edge for reliable capture. The zero hold time means the D input can change immediately after the clock edge without risk of metastability. The asynchronous clear (CLR) overrides everything: when CLR goes LOW, all Q outputs immediately go LOW, regardless of CLK or D. When CLR is HIGH, the flip-flops operate normally on clock edges. In a parallel data register application, four data bits are presented to the D inputs, and a single clock edge captures all four simultaneously. This is useful for sampling a parallel bus, synchronizing asynchronous inputs to the system clock, or creating a pipeline stage.

Descripción de la clavija:SN74LS175N Definición y funciones de las clavijas

Pin	Nombre	Tipo	Descripción
1	CLR	Entrada	Asynchronous clear (active LOW, resets all Q to LOW)
2	1Q	Salida	Flip-flop 1 true output
3	1Q̅	Salida	Flip-flop 1 complementary output
4	1D	Entrada	Flip-flop 1 data input
5	2D	Entrada	Flip-flop 2 data input
6	2Q̅	Salida	Flip-flop 2 complementary output
7	2Q	Salida	Flip-flop 2 true output
8	GND	Potencia	Suelo
9	CLK	Entrada	Clock (rising edge triggers data capture)
10	3Q	Salida	Flip-flop 3 true output
11	3Q̅	Salida	Flip-flop 3 complementary output
12	3D	Entrada	Flip-flop 3 data input
13	4D	Entrada	Flip-flop 4 data input
14	4Q̅	Salida	Flip-flop 4 complementary output
15	4Q	Salida	Flip-flop 4 true output
16	VCC	Potencia	Supply (4.75V to 5.25V)

Application Scenarios:In which products and applications isSN74LS175N usado

Parallel Register: 4-bit data bus → D inputs; CLK edge captures all 4 bits simultaneously; Q outputs hold data for downstream logic
Synchronizer: Asynchronous inputs → D; CLK = system clock; Q outputs are synchronous to clock domain
Address Latch: Multiplexed address/data bus → D; ALE signal → CLK; Q holds address during data phase
Frequency ÷2: Connect Q̅ to D; CLK input = input frequency; Q output = half frequency (toggle mode)
Digital Delay: Chain of 175s; data passes through each register on successive clock edges; 4-clock delay per stage

Alternative Models:What chips are recommended as replacements for SN74LS175N

Modelo	Fabricante	Diferencia clave	Paquete	Supply
74LS175N	TI/Nexperia	Original TTL version with 5V-only supply, typical propagation delay 10-15ns	DIP-16	5V TTL
74LS175D	TI/Nexperia	Surface-mount SOIC version of LS with identical logic function	SOIC-16	5V TTL
74HC175D	TI/Nexperia	CMOS version with wide 2-6V supply range, lower power consumption and higher noise immunity	SOIC-16	2-6V CMOS
74HC175N	TI/Nexperia	Through-hole DIP version of HC family for prototyping and repair	DIP-16	2-6V CMOS
74HCT175D	TI/Nexperia	CMOS with TTL-compatible input levels, ideal for mixing with LS devices at 5V	SOIC-16	4.5-5.5V TTL-in
74HCT175N	TI/Nexperia	Through-hole DIP version of HCT family for prototyping and repair	DIP-16	4.5-5.5V TTL-in
74LVC175D	TI/Nexperia	Low-voltage CMOS for 1.65-3.6V modern logic with 24mA output drive and bus-hold inputs	SOIC-16	1.65-3.6V CMOS
74LVC175N	TI/Nexperia	Through-hole DIP version of LVC family for prototyping and repair	DIP-16	1.65-3.6V CMOS

The 74175 is a Quad D-Type Flip-Flop with Clear. Family variants span from the original LS TTL (5V only) to modern LVC/AUP (down to 0.8V). HC and HCT versions offer 2-6V CMOS operation with HCT providing TTL-compatible input thresholds for mixed 5V systems. CD4000-series equivalents offer the widest 3-18V supply range at the cost of lower switching speed. DIP packages (N suffix) are through-hole; SOIC (D suffix) and TSSOP are surface-mount.