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Tektronix 7B90P
400 MHz programmable timebase
Tektronix 7B90P front

Compatible with 7000-series scopes

Produced from 1978 to 1989

ROM Images
File Pos. Checksum
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 7B90P is a digitally programmable 400 MHz time-base plug-in for the digitizing mainframes of the 7000 series. All controls are programmable except for the sweep calibration screwdriver adjustment and the external trigger input terminator switch. The local/remote state of the 7B90P is slaved to the local/remote state of the mainframe.

Key Specifications

Sweep 10 ns/Div to 500 ms/Div (1–2–5), ×10 magnifier (down to 500 ps/Div), no variable sweep, adjustable and programmable holdoff
Excluded sweep First 10 ns in 79XX programmable mainframes
Trigger Sensitivity
  • PP Auto Mode AC or DC: 125 mV or 0.5 Div up to 50 MHz, 375 mV or 1.5 Div up to 400 MHz
  • Norm or Single Sweep AC: 100 mV or 0.3 Div up to 50 MHz, 250 mV or 1.5 Div up to 400 MHz
Jitter <100 ps at 400 MHz
Ext. Trigger 1 MΩ: 20 pF, max. 250 V DC+peak AC; 50 Ω: max. 1 W
Sweep/Trigger Modes Peak-Peak Auto, Auto, Norm, Single Sweep


Documents Referencing 7B90P

Document Class Title Authors Year Links
Tekscope 1979 V11 N1.pdf Article An Intelligent, Programmable Transient Digitizer Dale Aufrecht 1979


The 7B90P is controlled by a Motorola 6800 microprocessor.



Some Parts Used in the 7B90P

Part Part Number(s) Class Description Used in
155-0049-00 155-0049-00 155-0049-01 155-0049-02 Monolithic integrated circuit sweep control with lockout 335 464 465 466 475 475A 475M 485 5B31 5B40 5B52 5B42 5B44 7B53A 7B80 7B85 7B87 7B92A 7B90P 7B10 7B15 SC502 7B42N AN/USM-281C 067-0657-00
155-0109-00 155-0109-00 155-0109-01 Monolithic integrated circuit trigger 5B25N 5B31 5B40 5B42 5B44 5S14N 7B50A 7B53A 7B80 7B85 7B87 7B81P 7B90P 7S14 7612D SC502 SC503 SC504
155-0126-00 155-0126-00 Monolithic integrated circuit trigger source selector and P-P auto amplifier 7B50A 7B80 7B85 7B87 7B81P 7B90P
155-0164-00 155-0164-00 Hybrid integrated circuit time slot switch 7A16P 7B90P 7A29P
Motorola 6800 156-0426-00 Monolithic integrated circuit 8-bit microprocessor 021-0206-00 021-0374-00 067-0902-00 067-1137-99 222 222A 222PS 2424L 2445 2465 4051 7912 7912AD 7A16P 7A29P 7B81P 7B90P 833 834 CG5001 CG551AP CG5010 CG5011 DF1 DF2 DM5010 MI5010 SI5010 PS5004 PS5010 SG5010
Motorola 6820 156-0427-00 Monolithic integrated circuit "Peripheral Interface Adapter (PIA)" 021-0206-00 7A16P 7B81P 7B90P
Motorola 6821 156-0427-03 156-1205-00 Monolithic integrated circuit "Peripheral Interface Adapter (PIA)" 067-1137-99 7A16P 7A29P 7B90P