NXP USA Inc. 74HC259D,653
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- 74HC259D,653
- NXP USA Inc.
- IC 8BIT ADDRESSABLE LATCH 16SOIC
- Logic - Latches
- 74HC259D,653 Datasheet
- 16-SOIC (0.154\", 3.90mm Width)
- Bulk
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Lead free / RoHS Compliant - 17447
- Spot Inventory / Athorized Dstributor / Factory Excess Stock
- 1 year quality assurance 》
- Click to get rates
What is 74HC259D,653
NXP USA Inc. Part Number 74HC259D,653（Logic - Latches）, developed and manufactured by NXP USA Inc., distributed globally by Jinftry. We distribute various electronic components from world-renowned brands and provide one-stop services, making us a trusted global electronic component distributor.
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74HC259D,653 Specifications
- Part Number74HC259D,653
- CategoryLogic - Latches
- ManufacturerNXP USA Inc.
- DescriptionIC 8BIT ADDRESSABLE LATCH 16SOIC
- PackageBulk
- Series74HC
- Voltage - Supply2V ~ 6V
- Operating Temperature-40°C ~ 125°C
- Mounting TypeSurface Mount
- Package / Case16-SOIC (0.154\", 3.90mm Width)
- Supplier Device Package16-SO
- Output TypeStandard
- Circuit1:8
- Current - Output High, Low5.2mA, 5.2mA
- Logic TypeD-Type, Addressable
- Independent Circuits1
- Delay Time - Propagation17ns
Application of 74HC259D,653
74HC259D,653 Datasheet
74HC259D,653 Datasheet , Bulk,74HC,2V ~ 6V,-40°C ~ 125°C,Surface Mount,16-SOIC (0.154\", 3.90mm Width),16-SO,Standard,1:8,5.2mA, 5.2mA,D-Type, Addressable,1,17ns
74HC259D,653 Classification
Logic - Latches
FAQ about Logic - Latches
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1. What is latch logic?
A latch is a level-triggered storage unit that can keep its output state unchanged under certain conditions until a new input signal is received to change it.
Latches are usually used in combinational logic. When a signal needs to maintain its original value under certain conditions, the latch will be activated.
Working principle
The working principle of the latch is based on level triggering. When the latch is in the enabled state, its output will change with the change of the input signal; and when the latch is locked, the output will remain unchanged until the next enable signal arrives. The output state of the latch is determined by its input signal and the control signal.
Classification
There are many types of latches, the common ones are RS latches, gated RS latches and D latches. Taking the D latch as an example, its circuit is mainly composed of an RS latch composed of two NAND gates and a control circuit. The control signal is used to control whether the D input signal is latched.
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2. What is the difference between NAND latches and NOR latches?
The main difference between NAND latch and NOR latch is their logic function and circuit structure.
Logic Function
NAND latch: When all inputs are high, the output is low; when at least one input is low, the output is high. This logic function makes the NAND latch output high as long as one of the multiple input signals is low.
NOR latch: When all inputs are low, the output is high; when at least one input is high, the output is low. This logic function means that the output will go low as long as one input is high. -
3. Why avoid using latches in FPGA?
The main reasons to avoid using latches in FPGA design include the following:
Circuit stability issues: Latches are sensitive to glitches and are easily disturbed by glitches on the signal, causing the circuit to become unstable.
Timing analysis difficulties: Latches are not conducive to static timing analysis because the timing characteristics of latches are unclear and the tool cannot determine the specific moment of data transmission, which may lead to timing violations and affect the performance and stability of the system.
Resource consumption issues: In FPGAs, the use of latches will lead to resource waste. For example, in Xilinx FPGAs, SLICEM resources can be configured as latches or flip-flops. If you choose to configure them as latches, the resources of other flip-flops will be wasted.
Debug and verification complexity: Designs containing latches will increase the complexity during debugging and verification because the behavior of latches is not as regular and predictable as registers.
Difficulty in optimization of synthesis tools: Modern synthesis tools are relatively mature and efficient in handling flip-flops, but the optimization of latches may not be ideal, which may lead to unsatisfactory results in terms of area and power consumption.
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