Part Number : WS128K32-XG4TX
Function : 128K x 32 SRAM module, SMD 5962-93187
Package : 66 Pin PGA Type
Maker : White Electronic Designs , Micro Semi
Pinouts : 
Description :
FEATURES
1. Access Times of 15, 17, 20, 25, 35, 45, 55ns
2. MIL-STD-883 Compliant Devices Available
3. Packaging
- 66 pin, PGA Type, 1.075" square, Hermetic Ceramic HIP (Package 400)
- 68 lead, 40mm CQFP (G4T), 3.56mm (0.140"), (Package 502).
- 68 lead, 22.4mm CQFP (G2T), 4.57mm (0.180"), (Package 509)
- 68 lead, 22.4mm Low Profile CQFP (G1U), 3.57mm (0.140"), (Package 519)
4. Organized as 128Kx32; User Configurable as 256Kx16 or 512Kx8
5. Low Power Data Retention - only available in G2T package type
6. Commercial, Industrial and Military Temperature Ranges
7. 5 Volt Power Supply
8. Low Power CMOS
9. TTL Compatible Inputs and Outputs
10. Built in Decoupling Caps and Multiple Ground Pins for Low Noise Operation
11. Weight :
WS128K32-XG1UX - 5 grams typical
WS128K32-XG2TX - 8 grams typical
WS128K32-XH1X - 13 grams typical
WS128K32-XG4TX - 20 grams typical
12. All devices are upgradeable to 512Kx32
Datasheet PDF Download : 
Others datasheet of same file :
WS128K32XG4TX, WS128K32L-15G1UC, WS128K32L-15G1UCA,
WS128K32L-15G1UI, WS128K32L-15G1UIA