UT54ACS162245S
RadHard Schmitt CMOS 16-bit Bidirectional MultiPurpose Low Voltage Transceiver
Datasheet
March 12, 2003
FEATURES
∙Voltage translation
-3.3V bus to 2.5V bus
-2.5V bus to 3.3V bus
∙Cold sparing all pins
∙0.25μ Commercial RadHardT M CMOS
-Total dose: 300Krad(Si) and 1Mrad(Si)
-Single Event Latchup immune
∙High speed, low power consumption
∙Schmitt trigger inputs to filter noisy signals
∙Cold and Warm Spare - all outputs
∙Available QML Q or V processes
∙Standard Microcircuit Drawing 5962-02543
∙Package:
-48-lead flatpack, 25 mil pitch (.390 x .640)
DESCRIPTION
The 16-bit wide UT54ACS162245S MultiPurpose low voltage transceiver is built using Aeroflex UTMC’s Commercial
RadHardTM epitaxial CMOS technology and is ideal for space applications. This high speed, low power UT54ACS162245S low voltage transceiver is designed to perform multiple functions including: asynchronous two-way communication, Schmitt input buffering, voltage translation, warm and cold sparing. With VDD equal to zero volts, the UT54ACS162245S outputs and inputs present a minimum impedance of 1M Ω making it ideal for "cold spare" applications. Balanced outputs and low "on" output impedance make the UT54ACS162245S well suited for driving high capacitance loads and low impedance backplanes. The UT54ACS162245S enables system designers to interface 2.5 volt CMOS compatible components with 3.3 volt CMOS components. For voltage translation, the A port interfaces with the 2.5 volt bus; the B port interfaces with the 3.3 volt bus. The direction control (DIRx) controls the direction of data flow. The output enable (OEx) overrides the direction control and disables both ports. These signals can be driven from either port A or B. The direction and output enable controls operate these devices as either two independent 8-bit transceivers or one 16-bit transceiver.
LOGIC SYMBOL
O E1 |
(48) |
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G1 |
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O E2 |
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2EN1 (BA) |
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G2 |
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DIR2 |
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2EN2 (AB) |
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DIR1 |
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1EN1 (BA) |
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1EN2 (AB) |
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1A1 |
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1B1 |
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1A2 |
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1A3 |
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1B3 |
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1A4 |
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1B4 |
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1A5 |
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1B5 |
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1A6 |
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1B6 |
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1A7 |
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1B7 |
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1A8 |
(37) |
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1B8 |
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(13) |
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2A1 |
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21 |
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2B1 |
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22 |
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2A2 |
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(14) |
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2B2 |
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(16) |
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2A3 |
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2B3 |
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(32) |
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(17) |
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2A4 |
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2B4 |
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(19) |
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2A5 |
(30) |
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2B5 |
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(20) |
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2A6 |
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2B6 |
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(22) |
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(27) |
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2A7 |
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2B7 |
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(26) |
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2A8 |
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2B8 |
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PIN DESCRIPTION
Pin Names |
Description |
O Ex |
Output Enable Input (Active Low) |
DIRx |
Direction Control Inputs |
xAx |
Side A Inputs or 3-State Outputs (2.5V Port) |
xBx |
Side B Inputs or 3-State Outputs (3.3V Port) |
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1
PINOUTS
48-Lead Flatpack
Top View
DIR1 |
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1 |
48 |
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OE1 |
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1B1 |
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2 |
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1A1 |
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1B2 |
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3 |
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1A2 |
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V |
SS |
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4 |
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VSS |
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5 |
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1A3 |
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1B3 |
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1B4 |
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6 |
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1A4 |
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VDD1 |
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7 |
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VDD2 |
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1B5 |
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8 |
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1A5 |
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1B6 |
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1A6 |
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VSS |
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10 |
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VSS |
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1B7 |
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11 |
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1A7 |
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1B8 |
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12 |
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1A8 |
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2B1 |
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13 |
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2A1 |
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2B2 |
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14 |
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2A2 |
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V |
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15 |
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VSS |
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SS |
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2B3 |
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16 |
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2A3 |
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2B4 |
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17 |
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2A4 |
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18 |
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VDD2 |
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VDD1 |
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2B5 |
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19 |
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2A5 |
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20 |
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2A6 |
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2B6 |
21 |
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VSS |
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SS |
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22 |
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2A7 |
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2B7 |
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2A8 |
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2B8 |
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DIR2 |
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24 |
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O E2 |
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POWER TABLE
Port B |
Port A |
OPERATION |
3.3 Volts |
2.5 Volts |
Voltage Translator |
3.3 Volts |
3.3 Volts |
Non Translating |
2.5 Volts |
2.5 Volts |
Non Translating |
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When VDD2 is at 2.5 volts, either 2.5 or 3.3 volts CMOS logic levels can be applied to all control inputs. For proper operation
connect power to all VDD and ground all V SS pins (i.e., no floating VDD or VSS input pins). Tie unused inputs to VSS. Always insure VDD1 > VDD2 during operation of the part.
FUNCTION TABLE
ENABLE |
DIRECTION |
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O Ex |
DIRx |
OPERATION |
L |
L |
B Data To A Bus |
L |
H |
A Data To B Bus |
H |
X |
Isolation |
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COLD/WARM SPARE FUNCTION
The device will place all outputs into a high-impedance state if either VDD supply is taken to zero volts (IWS, warm spare), or if both VDD supplies are set to zero volts (ICS, cold spare).
DEVICE POWER UP FUNCTION
The device will place all outputs into a high-impedance during power-up. The high impedance state is maintained for a time period approximately equal to the rise time of VDD1 .
2
LOGIC DIAGRAM
2.5V PORT
DIR1 |
(1) |
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(48) |
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O E1 |
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1A1 |
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(2) |
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1B1 |
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1A2 |
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(3) |
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1B2 |
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1A3 |
(44) |
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(5) |
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1B3 |
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1A4 |
(43) |
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(6) |
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1B4 |
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1A5 |
(41) |
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(8) |
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1B5 |
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1A6 |
(40) |
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(9) |
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1B6 |
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1A7 |
(38) |
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(11) |
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1B7 |
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1A8 |
(37) |
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(12) |
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1B8 |
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3.3 V PORT
2.5V PORT
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DIR2 |
(24) |
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(25) |
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OE 2 |
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2A1 |
(36) |
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(13) |
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2B1 |
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2A2 |
(35) |
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(14) |
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2B2 |
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2A3 |
(33) |
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(16) |
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2B3 |
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2A4 |
(32) |
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(17) |
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2B4 |
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2A5 |
(30) |
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(19) |
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2B5 |
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2A6 |
(29) |
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(20) |
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2B6 |
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2A7 |
(27) |
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(22) |
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2B7 |
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2A8 |
(26) |
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(23) |
2B8 |
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3.3 V PORT
3
RADIATION HARDNESS SPECIFICATIONS 1 |
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PARAMETER |
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LIMIT |
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Total Dose |
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1.0E5 |
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SEL Latchup |
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>113 |
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Neutron Fluence |
(Note 2) |
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1.0E14 |
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Notes:
1.Logic will not latchup during radiation exposure within the limits defined in the table.
2.Not tested, inherent to CMOS technology.
UNITS
rad(Si)
MeV-cm2 /mg
n/cm2
ABSOLUTE MAXIMUM RATINGS1 |
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SYMBOL |
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PARAMETER |
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LIMIT (Mil only) |
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UNITS |
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VI/O |
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Voltage any pin |
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-.3 to VDD1 +.3 |
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V |
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(Note 2) |
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VDD1 |
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Supply voltage |
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-0.3 to 4.0 |
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V |
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VDD2 |
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Supply voltage |
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-0.3 to 4.0 |
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V |
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TSTG |
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Storage Temperature range |
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-65 to +150 |
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°C |
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TJ (Note 3) |
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Maximum junction temperature |
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+150 |
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°C |
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ΘJC |
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Thermal resistance junction to case |
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20 |
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°C/W |
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II |
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DC input current |
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±10 |
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mA |
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PD |
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Maximum power dissipation |
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1 |
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W |
Note:
1.Stresses outside the listed absolute maximum ratings may cause permanent damage to the device. This is a stress rating only, functional operation of the device at these or any other conditions beyond limits indicated in the operational sections is not recommended. Exposure to absolute maxim um rating conditions for extended periods may affect device reliability and performance .
2. For Cold Spare mode (V DD1 =VSS, V DD2 =VSS), V I/O may be -0.3V to the maximum recommended operating level of VDD1 +0.3V. 3. Maximum junction temperature may be increased to +175 oC during burn-in and life test.
DUAL SUPPLY OPERATING CONDITIONS |
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SYMBOL |
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PARAMETER |
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LIMIT |
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UNITS |
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VDD1 |
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Supply voltage |
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2.3 to 3.6 |
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V |
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VDD2 |
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Supply voltage |
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2.3 to 3.6 |
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V |
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VIN |
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Input voltage any pin |
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0 to VDD1 |
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V |
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TC |
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Temperature range |
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-55 to + 125 |
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°C |
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4