Winbond Electronics W24L257AQ-20, W24L257AQ-15, W24L257AK-20, W24L257AQ-12, W24L257AK-15 Datasheet

W24L257A

32K × 8 HIGH-SPEED CMOS STATIC RAM

GENERAL DESCRIPTION

The W24L257A is a high-speed, low-power CMOS static RAM organized as 32768 × 8 bits that operates on a single 3.3-volt power supply. This device is manufactured using Winbond's high performance CMOS technology.

FEATURES

∙High-speed access time: 12/15/20 nS (max.)

∙Low-power consumption: − Active: 200 mW (typ.)

∙Single +3.3V power supply

∙Fully static operation

∙All inputs and outputs directly TTL compatible

∙Three-state outputs

∙Available packages: 28-pin 300 mil SOJ, skinny DIP and standard type one TSOP (8 mm × 13.4 mm)

PIN CONFIGURATION

	A14			1		28			VDD
	A12			2		27
									WE
	A7			3		26			A13
	A6			4		25			A8
	A5			5		24			A9
	A4			6		23			A11
	A3
				7	28-DIP	22			OE
	A2
				8		21			A10
	A1			9
						20			CS
	A0			10		19			I/O8
	I/O1			11		18			I/O7
	I/O2			12		17			I/O6
	I/O3			13		16		I/O5
	VSS			14		15		I/O4
											A10
	OE		1			28
A11			2			27					CS
	A9		3			26					I/O8
	A8		4			25					I/O7
A13			5			24					I/O6
WE			6		28-pin	23					I/O5
VDD			7		TSOP	22					I/O4
A14			8			21					VSS
A12			9			20					I/O3
	A7		10			19					I/O2
	A6		11			18					I/O1
	A5		12			17					A0
	A4		13			16					A1
	A3		14			15					A2

BLOCK DIAGRAM

VDD

VSS

A0

.

DECODER

.

CORE

A14

ARRAY

ARRAY

CS

I/O1

CONTROL

.

OE

DATA I/O

.

I/O8

WE

PIN DESCRIPTION

SYMBOL					DESCRIPTION
A0−A14					Address Inputs
I/O1−I/O8					Data Inputs/Outputs
					Chip Select Input
	CS
					Write Enable Input
	WE
					Output Enable Input
	OE
VDD					Power Supply
VSS					Ground

	Publication Release Date: December 1996
- 1 -	Revision A5

W24L257A

TRUTH TABLE

	CS			OE		WE			MODE	I/O1-I/O8	VDD CURRENT
	H			X			X		Not Selected	High Z	ISB, ISB1
	L			H			H		Output Disable	High Z	IDD
	L			L			H		Read	Data Out	IDD
	L			X			L		Write	Data In	IDD

DC CHARACTERISTICS

Absolute Maximum Ratings

PARAMETER	RATING	UNIT
Supply Voltage to VSS Potential	-0.5 to +4.6	V
Input/Output to VSS Potential	-0.5 to VDD +0.5	V
Allowable Power Dissipation	1.0	W
Storage Temperature	-65 to +150	°C
Operating Temperature	0 to +70	°C

Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability of the device.

Operating Characteristics

(VDD = 3.3V ± 5%, VSS = 0V, Ta = 0 to 70° C)

PARAMETER

SYM

TEST CONDITIONS

MIN

TYP

MAX.

UNIT

.

.

.

Input Low Voltage

VIL

-

-0.5

-

+0.8

V

Input High Voltage

VIH

-

+2.0

-

VDD +0.3

V

Input Leakage Current

ILI

VIN = VSS to VDD

-10

-

+10

mA

Output Leakage

ILO

-10

-

+ 10

mA

VI/O = VSS to VDD, CS = VIH (min.)

Current

or OE = VIH (min.) or WE = VIL (max.)

Output Low Voltage

VOL

IOL = +8.0 mA

-

-

0.4

V

Output High Voltage

VOH

IOH = -4.0 mA

2.4

-

-

V

Operating Power

IDD

12

-

-

150

mA

CS = VIL (max.), I/O = 0 mA

Supply Current

Cycle = min.

15

-

-

120

mA

Duty = 100%

20

-

-

100

mA

Standby Power

ISB

-

-

20

mA

CS = VIH (min.), Cycle = min.

Supply Current

Duty = 100%

ISB1

-

-

200

mA

CS

³ VDD -0.2V

Note: Typical characteristics are at VDD = 3.3V, Ta = 25° C.

- 2 -

W24L257A

CAPACITANCE

(VDD = 3.3V, Ta = 25° C, f = 1 MHz)

PARAMETER	SYM.	CONDITIONS	MAX.	UNIT
Input Capacitance	CIN	VIN = 0V	6	pF
Input/Output Capacitance	CI/O	VOUT = 0V	8	pF

Note: These parameters are sampled but not 100% tested.

AC CHARACTERISTICS

AC Test Conditions

PARAMETER	CONDITIONS
Input Pulse Levels	0V to 3V
Input Rise and Fall Times	3 nS
Input and Output Timing Reference Level	1.5V
Output Load	CL = 30 pF, IOH/IOL = -4 mA/8 mA

AC Test Loads and Waveform

R1 320 ohm		R1 320 ohm
3.3V		3.3V
OUTPUT		OUTPUT
30 pF	R2	5 pF		R2
Including	350 ohm	Including		350 ohm
Jig and		Jig and
Scope		Scope
		(For TCLZ, TOLZ, TCHZ, T	, TWHZ	TOW)
		OHZ	,

	3.0V	90%	90%
	0V	10%	10%
		3 nS	3 nS

	Publication Release Date: December 1996
- 3 -	Revision A5