Features
∙Serial Peripheral Interface (SPI) Compatible
∙Supports SPI Modes 0 (0,0) and 3 (1,1)
∙Low Voltage and Standard Voltage Operation
5.0(VCC = 4.5V to 5.5V)
2.7 (VCC = 2.7V to 5.5V)
1.8(VCC = 1.8V to 3.6V)
∙2.1 MHz Clock Rate
∙32-Byte Page Mode
∙Block Write Protection
∙Write Protect (WP) Pin and Write Disable Instructions for Both Hardware and Software Data Protection
∙Self-Timed Write Cycle (5 ms Typical)
∙High ReliabilityProtect 1/4, 1/2, or Entire Array
Endurance: 100,000 Cycles
∙Automotive Grade and Extended Temperature Devices Available
∙8-Pin PDIP, 14-pin, 16-pin JEDEC SOIC, and 20-Pin TSSOP PackagesData Retention: 100 Years
Description
The AT25128 provides 131,072 bits of serial electrically erasable programmable read only memory (EEPROM) organized as 16,384 words of 8 bits each. The device is optimized for use in many industrial and commercial applications where low power and low voltage operation are essential. The AT25128 is available in space saving 8-pin PDIP, JEDEC SOIC, and 14-pin and 20-pin TSSOP packages.
(continued)
Pin Configurations
Pin Name Function
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8-Pin PDIP |
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14-Pin SOIC |
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CS |
Chip Select |
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SCK |
Serial Data Clock |
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CS |
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14 |
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VCC |
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SI |
Serial Data Input |
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SO |
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HOLD |
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CS |
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8 |
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VCC |
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NC |
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NC |
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SO |
Serial Data Output |
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SO |
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7 |
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HOLD |
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NC |
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WP |
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6 |
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SCK |
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GND |
Ground |
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NC |
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NC |
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GND |
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SI |
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WP |
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SCK |
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VCC |
Power Supply |
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GND |
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SI |
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WP |
Write Protect |
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HOLD |
Suspends Serial Input |
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NC |
No Connect |
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DC |
Don’t Connect |
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16-Lead SOIC |
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20-Lead TSSOP* |
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NC |
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20 |
NC |
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2 |
19 |
VCC |
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CS |
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CS |
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16 |
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VCC |
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SO |
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18 |
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HOLD |
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SO |
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15 |
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HOLD |
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SO |
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17 |
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NC |
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14 |
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NC |
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HOLD |
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NC |
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NC |
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16 |
NC |
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NC |
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12 |
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NC |
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15 |
NC |
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NC |
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6 |
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NC |
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WP |
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14 |
SCK |
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GND |
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SI |
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WP |
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7 |
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SCK |
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GND |
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8 |
9 |
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SI |
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DC |
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9 |
12 |
DC |
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NC |
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10 |
11 |
NC |
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* Note: Pins 3, 4 and 17, 18 are internally connected for 14-lead TSSOP socket compatibility.
SPI Serial
E2PROMs
128K (16384 x 8)
AT25128
Preliminary
Description (Continued)
The AT25128 is enabled through the Chip Select pin (CS) and accessed via a 3-wire interface consisting of Serial Data Input (SI), Serial Data Output (SO), and Serial Clock (SCK). All programming cycles are completely self-timed, and no separate ERASE cycle is required before WRITE.
BLOCK WRITE protection is enabled by programming the status register with one of four blocks of write protection. Separate program enable and program disable instruc-
tions are provided for additional data protection. Hardware data protection is provided via the WP pin to protect against inadvertent write attempts to the status register. The HOLD pin may be used to suspend any serial communication without resetting the serial sequence.
Absolute Maximum Ratings*
...................Operating Temperature |
-55°C to +125°C |
Storage Temperature...................... |
-65°C to +150°C |
Voltage on Any Pin |
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with Respect to Ground ..................... |
-1.0V to +7.0V |
Maximum Operating Voltage ........................... |
6.25V |
DC Output Current ......................................... |
5.0 mA |
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Block Diagram
*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.
2 AT25128
AT25128
Pin Capacitance (1)
Applicable over recommended operating range from TA = 25°C, f = 1.0 MHz, VCC = +5.0V (unless otherwise noted).
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Test Conditions |
Max |
Units |
Conditions |
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COUT |
Output Capacitance (SO) |
8 |
pF |
VOUT = 0V |
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CIN |
Input Capacitance (CS, SCK, SI, WP, HOLD) |
6 |
pF |
VIN = 0V |
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Note: 1. This parameter is characterized and is not 100% tested.
DC Characteristics
Applicable over recommended operating range from: TAI = -40°C to +85°C, V CC = +1.8V to +5.5V, TAC = 0°C to +70°C, V CC = +1.8V to +5.5V (unless otherwise noted).
Symbol |
Parameter |
Test Condition |
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Min |
Typ |
Max |
Units |
VCC1 |
Supply Voltage |
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1.8 |
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3.6 |
V |
VCC2 |
Supply Voltage |
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2.7 |
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5.5 |
V |
VCC3 |
Supply Voltage |
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4.5 |
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5.5 |
V |
ICC1 |
Supply Current |
VCC = 5.0V at 1 MHz, |
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3.0 |
mA |
SO = Open |
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ICC2 |
Supply Current |
VCC = 5.0V at 2 MHz, |
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5.0 |
mA |
SO = Open |
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μA |
ISB1 |
Standby Current |
VCC = 1.8V |
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CS = VCC |
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0.1 |
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ISB2 |
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μA |
Standby Current |
VCC = 2.7V |
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CS = VCC |
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0.2 |
0.5 |
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ISB3 |
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μA |
Standby Current |
VCC = 5.0V |
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CS = VCC |
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0.5 |
2.0 |
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IIL |
Input Leakage |
VIN = 0V to VCC |
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-3.0 |
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3.0 |
μA |
IOL |
Output Leakage |
VIN = 0V to VCC, |
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-3.0 |
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3.0 |
μA |
TAC = 0°C to 70°C |
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VIL (1) |
Input Low Voltage |
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-1.0 |
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VCC x 0.3 |
V |
VIH (1) |
Input High Voltage |
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VCC x 0.7 |
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VCC + 0.5 |
V |
VOL1 |
Output Low Voltage |
4.5V ≤ VCC ≤ 5.5V |
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IOL = 3.0 mA |
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0.4 |
V |
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VOH1 |
Output High Voltage |
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IOH = -1.6 mA |
VCC - 0.8 |
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V |
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VOL2 |
Output Low Voltage |
1.8V ≤ VCC ≤ 3.6V |
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IOL = 0.15 mA |
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0.2 |
V |
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VOH2 |
Output High Voltage |
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IOH = -100 μA |
VCC - 0.2 |
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Note: 1. VIL min and VIH max are reference only and are not tested.
3
AC Characteristics
Applicable over recommended operating range from TA = -40°C to +85°C, V CC = As Specified, CL = 1 TTL Gate and 100 pF (unless otherwise noted).
Symbol |
Parameter |
Voltage |
Min |
Max |
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4.5 - 5.5 |
0 |
2.1 |
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fSCK |
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SCK Clock Frequency |
2.7 - 5.5 |
0 |
2.1 |
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1.8 - 3.6 |
0 |
0.5 |
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tRI |
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4.5 - 5.5 |
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2 |
μs |
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Input Rise Time |
2.7 - 5.5 |
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2 |
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1.8 - 3.6 |
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tFI |
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4.5 - 5.5 |
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2 |
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Input Fall Time |
2.7 - 5.5 |
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tWH |
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4.5 - 5.5 |
200 |
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SCK High Time |
2.7 - 5.5 |
300 |
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1.8 - 3.6 |
800 |
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tWL |
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4.5 - 5.5 |
200 |
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SCK Low Time |
2.7 - 5.5 |
200 |
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1.8 - 3.6 |
800 |
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tCS |
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4.5 - 5.5 |
250 |
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CS High Time |
2.7 - 5.5 |
250 |
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1.8 - 3.6 |
1000 |
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tCSS |
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4.5 - 5.5 |
250 |
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CS Setup Time |
2.7 - 5.5 |
250 |
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1.8 - 3.6 |
1000 |
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tCSH |
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4.5 - 5.5 |
250 |
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CS Hold Time |
2.7 - 5.5 |
250 |
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1.8 - 3.6 |
1000 |
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tSU |
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4.5 - 5.5 |
50 |
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Data In Setup Time |
2.7 - 5.5 |
50 |
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1.8 - 3.6 |
100 |
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tH |
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4.5 - 5.5 |
50 |
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Data In Hold Time |
2.7 - 5.5 |
50 |
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1.8 - 3.6 |
100 |
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tHD |
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4.5 - 5.5 |
100 |
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Hold Setup Time |
2.7 - 5.5 |
100 |
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1.8 - 3.6 |
400 |
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tCD |
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4.5 - 5.5 |
100 |
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Hold Hold Time |
2.7 - 5.5 |
100 |
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1.8 - 3.6 |
400 |
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4.5 - 5.5 |
0 |
200 |
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tV |
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Output Valid |
2.7 - 5.5 |
0 |
200 |
ns |
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1.8 - 3.6 |
0 |
800 |
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tHO |
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Output Hold Time |
4.5 - 5.5 |
0 |
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2.7 - 5.5 |
0 |
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1.8 - 3.6 |
0 |
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tLZ |
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4.5 - 5.5 |
0 |
100 |
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Hold to Output Low Z |
2.7 - 5.5 |
0 |
100 |
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1.8 - 3.6 |
0 |
100 |
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(continued)
4 AT25128