Texas Instruments SN74LS628N
- Part Number:
- SN74LS628N
- Manufacturer:
- Texas Instruments
- Ventron No:
- 5213346-SN74LS628N
- Description:
- Voltage-controlled oscillator
- Datasheet:
- sn74ls628
- Technology familyLS
- Bits (#)1
- Supply voltage (min) (V)4.75
- Supply voltage (max) (V)5.25
- Input typeBipolar
- Output typePush-Pull
- Supply current (max) (μA)55000
- IOL (max) (mA)24
- IOH (max) (mA)-1.2
- Operating temperature range (°C)0 to 70
- RatingCatalog
These voltage-controlled oscillators (VCOs) are improved versions of the original VCO family: SN54LS124, SN54LS324 thru SN54LS327, SN74LS124, and SN74LS324 thru SN74LS327. These new devices feature improved voltage-to-frequency linearity, range, and compensation. With the exception of the 'LS624 and 'LS628, all of these devices feature two independent VCOs in a single monolithic chip. The 'LS624, 'LS625, 'LS626, and 'LS628 have complementary Z outputs. The output frequency for each VCO is established by a single external component (either a capacitor or crystal) in combination with voltage-sensitive inputs used for frequency control and frequency range. Each device has a voltage-sensitive input for frequency control; however, the 'LS624, 'LS628, and 'LS629 devices also have one for frequency range. (See Figures 1 thru 6).
The 'LS628 offers more precise temperature compensation than its 'LS624 counterpart. The 'LS624 features a 600 ohm internal timing resistor. The 'LS628 requires a timing resistor to be connected externally across Rext pins. Temperature compensation will be improved due to the temperature coefficient of the external resistor.
Figure 3 and Figure 6 contain the necessary information to choose the proper capacitor value to obtain the desired operating frequency.
A single 5-volt supply can be used: however, one set of supply voltage and ground pins (VCC and GND) is provided for the enable, synchronization-gating, and output sections, and a separate set (OSC VCC and OSC GND) is provided for the oscillator and associated frequency-control circuits so that effective isolation can be accomplished in the system. For operation of frequencies greater than 10 MHz, it is recommended that two independent supplies be used. Disabling either VCO of the 'LS625 and 'LS625 and 'LS627 can be achieved by removing the appropriate OSC VCC. An enable input is provided on the 'LS624, 'LS626, 'LS628, and 'LS629. When the enable input is low, the output is enabled: when the enable input is high, the internal oscillator is disabled, Y is high, and Z is low. Caution! Crosstalk may occur in the dual devices ('LS625, 'LS626, 'LS627 and 'LS629) when both VCOs are operated simultaneously. To minimize crosstalk, either of the following are recommended: (A) If frequencies are widely separated, use a 10-μh inductor between VCC pins. (B) If frequencies are closely spaced, use two separate VCC supplies or place two series diodes between the VCC pins.
The pulse-synchronization-gating section ensures that the first output pulse is neither clipped nor extended. The duty cycle of the square-wave output is fixed at approximately 50 percent.
The SN54LS624 thru SN54LS629 are characterized for operation over the full military temperature range of -55°C to 125°C. The SN74LS624 thru SN74LS629 are characterized for operation from 0°C to 70°C.
Through Hole 14-DIP (0.300 7.62mm) Active e4 programmable oscillator 19.3mm 20MHz 0.024A 45pF
Voltage-controlled oscillator 14-PDIP 0 to 70
-
ImagePart NumberManufacturerTechnology familyBits (#)Supply voltage (min) (V)Supply voltage (max) (V)Input typeOutput typeSupply current (max) (μA)IOL (max) (mA)IOH (max) (mA)Operating temperature range (°C)RatingNumber of channelsFeaturesView Compare
-
SN74LS628NLS14.755.25BipolarPush-Pull5500024-1.20 to 70Catalog---
-
TTL-4.755.25BipolarOpen-collector510004000 to 70Catalog6High speed (tpd 10-50ns)
-
TTL-4.755.25BipolarOpen-collector330001600 to 70Catalog6High speed (tpd 10-50ns)
-
TTL-4.755.25BipolarPush-Pull3300016-0.40 to 70Catalog6High speed (tpd 10-50ns)
Latest News
-
28 December 2023
74HC573 Transparent Latch Functions, Working Principle, Usage and Application
Ⅰ. What is a latch?Ⅱ. Overview of 74HC573Ⅲ. Pin configuration of 74HC573 latchⅣ. Functions of 74HC573 latchⅤ. How does 74HC573 latch work?Ⅵ. How to use 74HC573 latch?Ⅶ. Practical... -
29 December 2023
An Introduction to HEF4093BP CMOS NAND Schmitt Trigger
Ⅰ. What is HEF4093BP?Ⅱ. Symbol, footprint and 3D model of HEF4093BPⅢ. The specifications of HEF4093BPⅣ. Limiting values of HEF4093BPⅤ. How does HEF4093BP work?Ⅵ. HEF4093BP's market trendⅦ. Where is... -
29 December 2023
TPS54331DR Converter Replacements, Characteristics, Applications and Other Details
Ⅰ. Overview of TPS54331DRⅡ. Characteristics of TPS54331DR converterⅢ. Technical parameters of TPS54331DRⅣ. Typical application of TPS54331DR converterⅤ. Programming the slow start time of TPS54331DRⅥ. Pin configuration of TPS54331DR... -
02 January 2024
STM32F030C8T6 Microcontroller Features, Specifications, Package, Usage and Applications
Ⅰ. What is STM32F030C8T6?Ⅱ. What are the features of STM32F030C8T6?Ⅲ. Specifications of STM32F030C8T6Ⅳ. STM32F030C8T6 Flash reading and writingⅤ. Package of STM32F030C8T6Ⅵ. How to use STM32F030C8T6?Ⅶ. Where is STM32F030C8T6...
Help you to save your cost and time.
Reliable package for your goods.
Fast Reliable Delivery to save time.
Quality premium after-sale service.