Application Note Abstract

Comparison between CY14B256L and STK14C88-3 nvSRAM

AN20639

Author: Shivendra Singh

Associated Project: No

Associated Part Family: CY14B256L and STK14C88-3

Associated Application Notes: None

This application note compares the CY14B256L (0.25 μm) and the STK14C88-3 (0.8 μm) devices and presents the results.

Introduction

CY14B256L and STK14C88-3 are both 256K (32K x 8), 3V nvSRAMs in two different technologies, 0.25 μm and 0.8 μm respectively. These parts are functionally similar and can be used in the same applications. However there are differences in parameters, which should be considered when replacing one part with the other.

The specifications in the data sheets of CY14B256L (0.25 μm) and STK14C88-3 (0.8 μm) are compared. Table 1 lists the differences between these two devices. This comparison is not intended to be comprehensive, because there are sub- tle differences that are not relevant in most applications.

Table 1. Comparison Table

Most applications use autostore and autorecall features of nvSRAM. To simplify the comparison, all electrical parame- ters which may affect the application performance directly or indirectly are considered. Designers must consider these dif- ferences, and if necessary do appropriate changes in their design.

Only those specifications that differ between CY14B256L (0.25 μm) and STK14C88-3 (0.8 μm) nvSRAM are listed in Table 1. These specifications may cause functional issues when replacing one part with the other.

Specification	CY14B256L (35 nsec)		STK14C88-3 (35 nsec)
Endurance		200,000 cycles		1,000,000 cycles

Retention		20 year		100 year

DC Electrical Characteristics

Vcc

Icc1

Icc3

Icc4

VIH

Vcap [1]

Cin

2.7V min	3.6V max	3.0V min	3.6V max
	55 mA max		52 mA max
	10 mA max		9 mA max
	3 mA max		2 mA max
2.0V min	Vcc + 0.3V max	2.2V min	Vcc + 0.5V max
17 µF min	120 µF max	68 µF min	220 µF max
	7 pF max		5 pF max

AC Switching Characteristics

tOHA

tLZCE

tLZWE

3 ns min		5 ns min
3 ns min		5 ns min
3 ns min		5 ns min

Note

1.STK14C88-3 applications usually specify the use of 68 µF or 100 µF capacitors, which fall within the range of the CY14B256L device.

November 11, 2008

Document No. 001-20639 Rev. *C

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