ATMEL AT27C020 User Manual

BDTIC www.BDTIC.com/ATMEL

Features

•Fast Read Access Time – 55 ns

•Low-power CMOS Operation

–100 µA Max Standby

–25 mA Max Active at 5 MHz

•JEDEC Standard Packages

–32-lead PDIP

–32-lead PLCC

–32-lead TSOP

•5V ± 10% Supply

•High-reliability CMOS Technology

–2,000V ESD Protection

–200 mA Latch-up Immunity

•Rapid Programming Algorithm – 100 µs/Byte (Typical)

•CMOSand TTL-compatible Inputs and Outputs

•Integrated Product Identification Code

•Industrial and Automotive Temperature Ranges

•Green (Pb/Halide-free) Packaging Option

1. Description

The AT27C020 is a low-power, high-performance, 2,097,152-bit, one-time programmable read-only memory (OTP EPROM) organized as 256K by 8 bits. It requires only one 5V power supply in normal read mode operation. Any byte can be accessed in less than 55 ns, eliminating the need for speed-reducing WAIT states on highperformance microprocessor systems.

In read mode, the AT27C020 typically consumes 8 mA. Standby mode supply current is typically less than 10 µA.

The AT27C020 is available in a choice of industry-standard JEDEC-approved onetime programmable (OTP) plastic PDIP, PLCC and TSOP packages. All devices feature two-line control (CE, OE) to give designers the flexibility to prevent bus contention.

With 256K bytes storage capability, the AT27C020 allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media.

Atmel’s AT27C020 has additional features to ensure high quality and efficient production use. The Rapid Programming Algorithm reduces the time required to program the part and guarantees reliable programming. Programming time is typically only 100 µs/byte. The Integrated Product Identification Code electronically identifies the device and manufacturer. This feature is used by industry-standard programming equipment to select the proper programming algorithms and voltages.

2-megabit

(256K x 8) OTP EPROM

AT27C020

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2. Pin Configurations

Pin Name

A0 - A17

O0 - O7

CE

OE

PGM

2.132-lead PLCC Top View

	A12	A15	A16	VPP	VCC	PGM	A17
A7	4	3	2	1	32	31	30	A14
	5						29
A6	6						28	A13
A5	7						27	A8
A4	8						26	A9
A3	9						25	A11
A2	10						24
								OE
A1	11						23	A10
A0	12						22
								CE
O0	13	15	16	17	18	19	21	07
	14						20
	01	02	GND	03	04	05	06

2.232-lead PDIP Top View

VPP		1	32		VCC
A16		2	31
						PGM
A15		3	30		A17
A12		4	29		A14
A7		5	28		A13
A6		6	27		A8
A5		7	26		A9
A4		8	25		A11
A3		9	24
								OE
A2		10	23		A10
A1		11	22
							CE
A0		12	21		07
O0		13	20		06
O1		14	19	05
O2		15	18		04
GND		16	17	03

2 AT27C020

Function

Addresses

Outputs

Chip Enable

Output Enable

Program Strobe

2.332-lead TSOP (Type 1) Top View

	A11	1	32			OE
	A9	2	31			A10
	A8	3	30			CE
	A13	4	29		07
	A14	5	28		06
	A17	6	27		05
		7	26		04
	PGM
	VCC	8	25		03
	VPP	9	24			GND
	A16	10	23		02
	A15	11	22		01
	A12	12	21			O0
	A7	13	20			A0
	A6	14	19			A1
	A5	15	18			A2
	A4	16	17		A3

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AT27C020

3. System Considerations

Switching between active and standby conditions via the Chip Enable pin may produce transient voltage excursions. Unless accommodated by the system design, these transients may exceed datasheet limits, resulting in device non-conformance. At a minimum, a 0.1 µF highfrequency, low inherent inductance, ceramic capacitor should be utilized for each device. This capacitor should be connected between the VCC and Ground terminals of the device, as close to the device as possible. Additionally, to stabilize the supply-voltage level on printed circuit boards with large EPROM arrays, a 4.7 µF bulk electrolytic capacitor should be utilized, again connected between the VCC and Ground terminals. This capacitor should be positioned as close as possible to the point where the power supply is connected to the array.

4. Block Diagram

5.	Absolute Maximum Ratings*
Temperature under Bias		................................ -55°C to +125°C	*NOTICE: Stresses beyond those listed under “Absolute
			Maximum Ratings” may cause permanent dam-
Storage Temperature .....................................		-65°C to +150°C	age to the device. This is a stress rating only and
			functional operation of the device at these or any
Voltage on Any Pin with		-2.0V to +7.0V(1)	other conditions beyond those indicated in the
Respect to Ground .........................................			operational sections of this specification is not
Voltage on A9 with			implied. Exposure to absolute maximum rating
		-2.0V to +14.0V(1)	conditions for extended periods may affect device
Respect to Ground ......................................			reliability.
VPP Supply Voltage with		-2.0V to +14.0V(1)
Respect to Ground .......................................
Note:	1. Minimum voltage is -0.6V DC, which may undershoot to -2.0V for pulses of less than 20 ns. Maximum output pin voltage is
	VCC + 0.75V DC, which may overshoot to +7.0V for pulses of less than 20 ns.

3

0570G–EPROM–12/07

6. Operating Modes

Mode/Pin

CE

OE

PGM

Ai

VPP

Outputs

Read

VIL

VIL

X(1)

Ai

X

DOUT

Output Disable

X

VIH

X

X

X

High-Z

Standby

VIH

X

X

X

X

High-Z

Rapid Program(2)

V

IL

V

IH

V

IL

Ai

V

D

PP

IN

PGM Verify

VIL

VIL

VIH

Ai

VPP

DOUT

PGM Inhibit

VIH

X

X

X

VPP

High-Z

A9 = V (3)

Product Identification(4)

H

VIL

VIL

X

A0 = VIH or VIL

X

Identification Code

A1 - A17 = VIL

Notes: 1. X can be VIL or VIH.

2.Refer to Programming Characteristics.

3.VH = 12.0 ± 0.5V.

4.Two identifier bytes may be selected. All Ai inputs are held low (VIL) except A9, which is set to VH and A0, which is toggled low (VIL) to select the Manufacturer’s Identification byte and high (VIH) to select the Device Code byte.

7.DC and AC Operating Conditions for Read Operation

			AT27C020
		-55		-90
Operating Temperature (Case)	Ind.	-40° C - 85° C		-40° C - 85° C
	Auto.			-40° C - 125° C
VCC Power Supply		5V ± 10%		5V ± 10%

8. DC and Operating Characteristics for Read Operation

Symbol	Parameter	Condition							Min	Max	Units
ILI	Input Load Current	VIN = 0V to VCC (Com., Ind.)								±1.0	µA
ILO	Output Leakage Current	VOUT = 0V to VCC (Com., Ind.)								±5.0	µA
IPP(2)	VPP(1) Read/Standby Current	VPP = VCC								±10	µA
		ISB1 (CMOS),				= VCC ± 0.3V				100	µA
ISB	VCC(1) Standby Current			CE
		ISB2 (TTL), CE = 2.0 to VCC + 0.5V								1.0	mA
ICC	VCC Active Current	f = 5 MHz, IOUT = 0 mA,						= VIL		25	mA
							CE
VIL	Input Low Voltage								-0.6	0.8	V
VIH	Input High Voltage								2.0	VCC + 0.5	V
VOL	Output Low Voltage	IOL = 2.1 mA								0.4	V
VOH	Output High Voltage	IOH = -400 µA							2.4		V

Notes: 1. VCC must be applied simultaneously or before VPP, and removed simultaneously or after VPP.

2. VPP may be connected directly to VCC except during programming. The supply current would then be the sum of ICC and IPP.

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