74LS189 – 64-BIT RANDOM ACCESS MEMORY

Part Number : 74LS189

Function : 64-BIT RANDOM ACCESS MEMORY

Manufactures : Fairchild Semiconductor

Images :
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74LS189 image

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pinout

Description :

The 74LS189 is a high speed 64-bit RAM organized as a 16-word by 4-bit array. Address inputs are buffered to minimize loading and are fully decoded on-chip. The outputs are 3-state and are in the high impedance state whenever the chip select (CS) input is HIGH. The ouputs are active only in the read mode and the output is the complement of the stored data.

Features

1. 3-State ouputs for data bus applicatons
2. Buffered inputs minimize loading
3. Address decoding on-chip
4. Diode clamped inputs minimize ringing

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image

74LS189 Datasheet


SD6864 Datasheet – Current Mode PWM+PFM Controller

Part Number : SD6864

Function : CURRENT MODE PWM+PFM CONTROLLER WITH BUILT-IN HIGH VOLTAGE MOSFET

Package :  DIP 8 Pin Type

Manufactures : www.silan.com.cn

Image
SD6864 PWM PFM Controller

Description

SD686X is current mode PWM+PFM controller with built-in high-voltage MOSFET used for SMPS, with low standby power and low start current for power switch. In standby mode, the circuit enters burst mode to reduce the standby power dissipation. The switch frequency is 25~67KHz with jitter frequency for low EMI.

Built-in peak current compensation circuit makes the limit peak current stable even with different input AC voltage. Limitoutput power can be adjusted through the resistor. Maximum peak current compensation during power-on reducespressure on transformer to avoid saturation, the peak current compensation will decrease for balance after power-on.

Pinout

SD6864 pinout datasheet

Features

1. Energy Star 2.0 standard
2. Lower start-up current (3μA)
3. Various switching frequency following load for the higher efficiency
4. Frequency jitter for low EMI
5. Overvoltage, primary winding overcurrent, overload and over temperature protections.

 

Official Homepage : http://www.silan.com.cn/english/product/ProductItemDetail.aspx?id=18&pid=20140522023939635363663793249807&c=

SD6864 Datasheet