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Features
* 8-Bit Multiplexed Addresses/Outputs * Fast Read Access Time - 70 ns * Low Power CMOS Operation * * * * * * * * *
- 20 mA max. Active at 5 MHz 20-Lead TSSOP Package 20-Lead SOIC Package 28-Lead TSOP Package 5V 10% Supply High Reliability CMOS Technology - 2,000V ESD Protection - 200 mA Latchup Immunity RapidTM Programming Algorithm - 50 s/byte (typical) CMOS and TTL Compatible Inputs and Outputs Integrated Product Identification Code Commercial and Industrial Temperature Range
Description
The AT27C520 is a low-power, high performance 524,288 bit one-time programmable read only memory (OTP EPROM) organized 64K by 8 bits. It incorporates latches for the 8 lower order address bits to multiplex with the 8 data bits. This minimizes system chip count, reduces cost, and simplifies the design of multiplexed bus systems. It requires only one 5V power supply in normal read mode operation. Any byte can be accessed in less than 70 ns, eliminating the need for speed reducing WAIT states on high performance microprocessor systems. Atmel's scaled CMOS technology provides high speed, lower active power consumption, and significantly faster programming. Power consumption is typically only 8 mA in Active Mode. The AT27C520 is available in 173 mil, 20-pin TSSOP; 300 mil, 20-pin SOIC; and 28pin TSOP, one-time programmable (OTP) plastic packages. (continued)
512K (64K x 8) Multiplexed Addresses/ Outputs OTP EPROM AT27C520
Pin Configurations
Pin Name A8 - A15 AD0 - AD7 OE /VPP ALE Function Addresses Addresses/Outputs Output Enable/VPP Address Latch Enable TSOP Top View
A10 NC NC A12 A14 ALE VCC OE/VPP A15 A13 A11 NC NC A9 22 23 24 25 26 27 28 1 2 3 4 5 6 7 21 20 19 18 17 16 15 14 13 12 11 10 9 8 A8 NC NC AD1 AD3 AD5 AD7 GND AD6 AD4 AD2 NC NC AD0
TSSOP Top View
A10 A12 A14 ALE VCC OE/VPP A15 A13 A11 A9 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 A8 AD1 AD3 AD5 AD7 GND AD6 AD4 AD2 AD0
SOIC Top View
OE/VPP A15 A13 A11 A9 AD0 AD2 AD4 AD6 GND 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VCC ALE A14 A12 A10 A8 AD1 AD3 AD5 AD7
Rev. 0752C-C-01/98
1
With 64K byte storage capability, the AT27C520 allows firmware to be stored reliably and to be accessed by the system without the delays of mass storage media. Atmel's 27C520 has additional features to ensure high quality and efficient production use. The RapidTM Programming Algorithm reduces the time required to program the part and guarantees reliable programming. Programming time is typically only 50 s/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.
System Considerations
Switching under active conditions may produce transient voltage excursions. Unless accommodated by the system design, these transients may exceed data sheet limits, resulting in device non-conformance. At a minimum, a 0.1 F high frequency, 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 F bulk electrolytic capacitor should be utilized, again connected between the V CC and Ground terminals. This capacitor should be positioned as close as possible to the point where the power supply is connected to the array.
Block Diagram
VCC GND OE/VPP ALE OE, ALE, AND PROGRAM LOGIC OUTPUT BUFFERS 8
LATCHES
Y DECODER
Y-GATING
AD7 - AD0
A15 - A8
8
X DECODER
CELL MATRIX
IDENTIFICATION
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AT27C520
AT27C520
Absolute Maximum Ratings*
Temperature Under Bias ................................ -55C to +125C Storage Temperature ..................................... -65C to +150C Voltage on Any Pin with Respect to Ground .........................................-2.0V to +7.0V(1) Voltage on A9 with Respect to Ground ......................................-2.0V to +14.0V(1) Note: VPP Supply Voltage with Respect to Ground .......................................-2.0V to +14.0V(1) 1. *NOTICE: Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 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.
Operating Modes
Mode/Pin Read Output Disable Address Latch Enable Rapid Program
(2)
ALE VIL VIL/VIH VIH VIH
(3)
OE/VPP VIL VIH VIH VPP VIL
A8 - A15 Ai X
(1)
AD0 - AD7 DOUT High Z/A0 - A7 A0 - A7 DIN Identification Code
X Ai A9 = VH(4) A8 = VIH or VIL A10 - A15 = VIL
Product Identification
Notes:
VIL
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 A8 - A15 inputs are held low (VIL), except A9 which is set to VH and A8 which is toggled low (VIL) to select the Manufacturer's Identification byte and high (VIH) to select the Device Code byte.
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DC and AC Operating Conditions for Read Operation
AT27C520 -70 Operating Temp.(Case) VCC Supply Com. Ind. 0C - 70C -40C - 85C 5V 10% -90 0C - 70C -40C - 85C 5V 10%
DC and Operating Characteristics for Read Operation
Symbol ILI ILI2 ILO ICC VIL VIH VOL VOH
Note:
(1)
Parameter Input Load Current Input Load Current A13 Output Leakage Current VCC Active Current Input Low Voltage Input High Voltage Output Low Voltage Output High Voltage
Condition VIN = 0V to VCC VIN = 0V to VCC VOUT = 0V to VCC f = 5 MHz, IOUT = 0 mA
Min
Max 1 100 5 20
Units A A A mA V V V V
-0.6 2.0 IOL = 2.1 mA IOH = -400 A 2.4
0.8 VCC + 0.5 0.4
1. For address input A13 only.
AC Characteristics for Read Operation
AT27C520 -70 Symbol tACC(2) tAS tAH tALE tOE(2) tDF(3)(4) tOH Notes: Parameter Address to Output Delay Address Setup Time Address Hold Time Address Latch Enable Width OE/VPP to Output Delay OE/VPP High to Output Float Output Hold from Address or OE/VPP , whichever occurred first Condition ALE = OE/VPP = VIL OE/VPP = VIH OE/VPP = VIH OE/VPP = VIH ALE = VIL ALE = VIL ALE = VIL 7 12 12 40 30 25 0
Min Max Min
-90
Max
Units ns ns ns ns
70 15 15 45
90
35 25
ns ns ns
1. 2, 3, 4 -- see AC Waveforms for Read Operation
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AT27C520
AT27C520
AC Waveforms for Read Operation(1)
tALE ALE
OE/VPP tDF tAS AD7 - AD0 ADDRESS IN tACC A15 - A8
Notes: 1. 2. 3. 4. Timing measurement reference levels for all speed grades are VOL = 0.8V and VOH = 2.0V. Input AC drive levels are VIL = 0.45V and VIH = 2.4V. OE/VPP may be delayed up to tACC - tOE after the address is valid without impact on tACC. This parameter is only sampled and is not 100% tested. Output float is defined as the point when data is no longer driven.
tAH
tOE
tOH DATA OUT
Input Test Waveforms and Measurement Levels
For -70 and -90 devices:
Output Test Load
tR, tF < 20 ns (10% to 90%)
Note: CL = 100 pF including jig capacitance.
Pin Capacitance (f = 1 MHz, T = 25C)(1)
Typ CIN COUT
Note:
Max 6 12
Units pF pF
Conditions VIN = 0V VOUT = 0V
4 8
1. Typical values for nominal supply voltage. This parameter is only sampled and is not 100% tested.
5
Programming Waveforms
PROGRAM VCC 6.5V 5.0V tVCS 13V OE/VPP VIH VIL tPRT ALE VIH VIL tLP tALE tLAS ADDR tAS A15 - A8 VIH VIL ADDRESS STABLE tLAH tPW tDS DATA IN tDH tALE tOE AD7 - AD0 VIH VIL tLAS ADDR tLAH DATA OUT tAH tDFP tOES tOEH tVR READ (VERIFY)
Notes:
1. 2.
The Input Timing Reference is 0.8V for VIL and 2.0V for VIH. tOE and tDFP are characteristics of the device but must be accommodated by the programmer.
DC Programming Characteristics
TA = 25 5C, VCC = 6.5 0.25V, OE/VPP = 13.0 0.25V Limits Symbol ILI ILI2
(1)
Parameter Input Load Current Input Load Current A13 Input Low Level Input High Level Output Low Voltage Output High Voltage VCC Supply Current (Program and Verify) OE/VPP Current
Test Conditions VIN = VIL, VIH VIN = VIL, VIH
Min
Max 10 100
Units A A V V V V
VIL VIH VOL VOH ICC2 IPP2
Note:
-0.6 2.0 IOL = 2.1 mA IOH = -400 A 2.4
0.8 VCC + 1.0 0.4
25 ALE = VIH 25
mA mA
1. For address input A13 only.
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AT27C520
AT27C520
AC Programming Characteristics
TA = 25 5C, VCC = 6.5 0.25V, OE/VPP = 13.0 0.25V
Limits Symbol tALE tLAS tLAH tLP tOES tOEH tDS tDH tPW tVR tVCS tOE tDFP tAS tAH tPRT Notes: Parameter
(1)
Test Conditions
Min 500 100 100 2
Max
Units ns ns ns s s s s s s s s
Address Latch Enable Width Latched Address Setup Time Latched Address Hold Time ALE Low to OE/VPP High Voltage Delay OE/VPP Setup Time OE/VPP Hold Time Data Setup Time Data Hold Time ALE Program Pulse Width(2) OE/VPP Recovery Time VCC Setup Time Data Valid from OE/VPP OE/VPP High to Output Float Delay(3) Address Setup Time Address Hold Time OE/VPP Pulse Rise Time During Programming
Input Rise and Fall Times (10% to 90%) 20 ns Input Pulse Levels 0.45V to 2.4V Input Timing Reference Level 0.8V to 2.0V Output Timing Reference Level 0.8V to 2.0V
2 2 2 2 47.5 2 2 150 0 2 0 50 130 52.5
ns ns s s ns
1. VCC must be applied simultaneously or before OE/VPP and removed simultaneously or after OE/VPP . 2. Program Pulse width tolerance is 50 sec 5%. 3. This parameter is only sampled and is not 100% tested. Output Float is defined as the point where data is no longer driven -- see timing diagram.
Atmel's 27C520 Integrated Product Identification Code
Pins Codes Manufacturer Device Type A8 0 1 AD7 0 1 AD6 0 0 AD5 0 0 AD4 1 1 AD3 1 1 AD2 1 1 AD1 1 0 AD0 0 1 Hex Data 1E 9D
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RapidTM Programming Algorithm
A 50 s ALE pulse width is used to program. The address is set to the first location. VCC is raised to 6.5V and OE/VPP is raised to 13.0V. Each address is first programmed with one 50 s ALE pulse without verification. Then a verification/reprogramming loop is executed for each address. In the event a byte fails to pass verification, up to 10 successive 50 s pulses are applied with a verification after each pulse. If the byte fails to verify after 10 pulses have been applied, the part is considered failed. After the byte verifies properly, the next address is selected until all have been checked. OE/VPP is then lowered to VIH and VCC to 5.0V. All bytes are read again and compared with the original data to determine if the device passes or fails.
START
ADDR = FIRST LOCATION VCC = 6.5V VPP = 13.0V PROGRAM ONE 50 S PULSE
INCREMENT ADDRESS
NO
LAST ADDR.? YES
ADDR = FIRST LOCATION INCREMENT ADDRESS NO LAST ADDR.? YES PROGRAM ONE 100 S PULSE NO X = 10? PASS VERIFY BYTE FAIL INCREMENT X X=0
YES
VCC = 5.0V VPP = 5.0V
COMPARE ALL BYTES TO ORIGINAL DATA
FAIL
DEVICE FAILED
PASS DEVICE PASSED
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AT27C520
AT27C520
Ordering Information
tACC (ns) 70 ICC (mA) Active 20 Ordering Code AT27C520-70SC AT27C520-70TC AT27C520-70XC AT27C520-70SI AT27C520-70TI AT27C520-70XI 90 20 AT27C520-90SC AT27C520-90TC AT27C520-90XC AT27C520-90SI AT27C520-90TI AT27C520-90XI Package 20S 28T 20X 20S 28T 20X 20S 28T 20X 20S 28T 20X Operation Range Commercial (0C to 70C) Industrial (-40C to 85C) Commercial (0C to 70C) Industrial (-40C to 85C)
Package Type 20S 28T 20X 20-Lead, 0.300" Wide, Plastic Gull-Wing Small Outline (SOIC) 28-Lead, Thin Small Outline Package (TSOP) 20-Lead, 0.173" Wide, Thin Shrink Small Outline (TSSOP)
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Packaging Information
20S, 20-Lead, 0.300" Wide, Plastic Gull Wing Small Outline Dimensions in Inches and (Millimeters) 28T, 28-Lead, Plastic Thin Small Outline Package (TSOP) Dimensions in Millimeters and (Inches)
.020(.508) .013(.330)
.299(7.60) .420(10.7) .291(7.39) .393(9.98) PIN 1 ID
.050(1.27) BSC .513(13.0) .497(12.6)
.105(2.67) .092(2.34)
.012(.305) .003(.076)
.013(.330) .009(.229) 0 REF 8 .035(0.889) .015(.381)
20X, 20-Lead, 0.173" Wide, Thin Super Small Outline Package (TSSOP) Dimensions in (Millimeters) and Inches
0.30(0.012) 0.18(0.007)
4.48(.176) 6.50(.256) 4.30(.169) 6.25(.246) PIN 1 ID
0.65(.0256) BSC 6.60(.260) 6.40(.252)
1.10(0.043) MAX
0.15(.006) 0.05(.002)
0.18(.007) 0.09(.003) 0 REF 8 0.70(.028) 0.50(.020)
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AT27C520

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