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ADM1385ARSZ

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Analog Devices RS232 ICs, SSOP-20-208mil. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Contents

README

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ADM1385ARSZ

Analog Devices · RS232 ICs · SSOP-20-208mil

ADM1385ARSZ from Analog Devices, in a SSOP-20-208mil. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 DD input Driver disable input; when low, the charge pump is turned off and the transmitters are disabled while the receivers remain active.
2 C1+ passive Positive terminal of external charge pump capacitor C1; a 0.1 µF capacitor is recommended, with larger capacitors up to 47 µF allowed.
3 V+ power_out Internally generated positive supply, +6 V nominal.
4 C1- passive Negative terminal of external charge pump capacitor C1; a 0.1 µF capacitor is recommended, with larger capacitors up to 47 µF allowed.
5 C2+ passive Positive terminal of external charge pump capacitor C2; a 0.1 µF capacitor is recommended, with larger capacitors up to 47 µF allowed.
6 C2- passive Negative terminal of external charge pump capacitor C2; a 0.1 µF capacitor is recommended, with larger capacitors up to 47 µF allowed.
7 V- power_out Internally generated negative supply, −6 V nominal.
8 T2OUT output Transmitter 2 RS-232 output at RS-232 signal levels, typically ±9 V.
9 R2IN input Receiver 2 input accepting RS-232 signal levels, with an internal 5 kΩ pull-down to GND and protection up to ±30 V.
10 NC unconnected No connect.
11 NC unconnected No connect.
12 R2OUT output Receiver 2 CMOS logic output.
13 T2IN input Transmitter 2 input accepting TTL/CMOS logic levels.
14 T1IN input Transmitter 1 input accepting TTL/CMOS logic levels.
15 R1OUT output Receiver 1 CMOS logic output.
16 R1IN input Receiver 1 input accepting RS-232 signal levels, with an internal 5 kΩ pull-down to GND and protection up to ±30 V.
17 T1OUT output Transmitter 1 RS-232 output at RS-232 signal levels, typically ±9 V.
18 GND power_in Ground pin; must be connected to 0 V.
19 VCC power_in Power supply input, 3.3 V ± 0.3 V.
20 SD input Shutdown control, active low; when low, the charge pump is shut down and all transmitters and receivers are disabled.

Key specifications

Parameter Value
Manufacturer Analog Devices
Package SSOP-20-208mil
Category Communication Interface Chip/UART/485/232
Pins 20

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter Symbol Min Typ Max Unit Conditions Page
Operating Voltage Range VCC 3 3.3 5.5 V 3
VCC Power Supply Current ICC 1.3 3 mA No load 3
VCC Power Supply Current ICC 8 12 mA RL = 3 kΩ to GND 3
Shutdown Supply Current 0.01 0.5 μA 3
Input Logic Threshold Low VINL 0.8 V TIN 3
Input Logic Threshold High VINH 2 V TIN 3
CMOS Output Voltage Low VOL 0.4 V IOUT = 1.6 mA 3
Logic Pull-Up Current 5 10 μA TIN = GND to VCC 3
Output Leakage Current -10 10 μA Receivers disabled 3
EIA-232 Input Voltage Range -30 30 V 3
EIA-232 Input Threshold Low 0.6 1.2 V 3
EIA-232 Input Threshold High 1.6 2.4 V 3
EIA-232 Input Hysteresis 0.4 V 3
EIA-232 Input Resistance 3 5 7 kΩ 3
Output Voltage Swing (RS-232) 5 5.2 V VCC = 3.3 V, all transmitter outputs loaded with 3 kΩ to ground 3
Transmitter Output Resistance 300 Ω VCC = 0 V, VOUT = ±2 V 3
RS-232 Output Short-Circuit Current -15 15 mA 3
Output Leakage Current (transmitter) -25 25 μA SD = low, VOUT = 12 V 3
Maximum Data Rate 460 kbps VCC = 3.3 V, RL = 3 kΩ to 7 kΩ, CL = 50 pF to 1000 pF, one Tx switching 3
Receiver Propagation Delay TPHL TPHL 0.4 1 μs 3
Receiver Propagation Delay TPLH TPLH 0.4 1 μs 3
Transmitter Propagation Delay 0.3 1.2 μs RL = 3 kΩ, CL = 1000 pF 3
Receiver Output Enable Time 200 ns 3
Receiver Output Disable Time 200 ns 3
Transition Region Slew Rate 5.5 10 30 V/μs Measured from +3 V to −3 V or −3 V to +3 V, VCC = +3.3 V; RL = 3 kΩ, CL = 1000 pF, TA = 25°C 3
VCC Supply Voltage (absolute maximum) VCC -0.3 6 V 4
V+ Supply Voltage (absolute maximum) V+ -0.3 14 V (VCC − 0.3 V) to +14 V 4
V− Supply Voltage (absolute maximum) V− -14 0.3 V +0.3 V to −14 V 4
RIN Input Voltage (absolute maximum) RIN -30 30 V 4
TOUT Output Voltage (absolute maximum) TOUT -15 15 V 4
Power Dissipation 450 mW Derates 6 mW/°C above 50°C 4
Thermal Impedance θJA (RS-20, 4-layer test board) θJA 83 °C/W RS-20 (4-Layer Test Board) 4
Operating Temperature Range (Industrial, A Version) TA -40 85 °C 4
Storage Temperature Range TSTG -65 150 °C 4

CAD (KiCad official)

  • Symbol: ADM1385ARSZ
  • Footprint: Package_SO:SSOP-20_5.3x7.2mm_P0.65mm
  • 3D model: SSOP-20-208mil (KiCad packages3D, STEP)
  • 3D model files: adm1385arsz-etched.step / adm1385arsz-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); adm1385arsz.step / adm1385arsz.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Analog Devices datasheet (16 pp, sha256 cd33ca7a96faf2c0, retrieved 2026-10-28, tier: manufacturer)
  • Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus claude-sonnet-5-5 (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF