QP26LS31 – Quad High Speed Differential Line Driver
QP26LS32 – Quad Differential Line Receiver
(200mv input sensitivity over ± 7V input range)
QP26LS33 – Quad Differential Line Receiver
(500mv input sensitivity over ± 15V input range)
October 9, 2007
The QP26LSxx family of interface products were re-engineered in a modern wafer fabrication process to replace AMD
26LSxx devices. All features of the AMD devices were duplicated; the devices are “plug and play” compatible. The
circuit design and wafer fab process selected duplicates the electrical characteristics of the original devices, including
parasitic performance. “Failsafe” characteristics were duplicated for the line receivers.
The QP26LSxx family is designed to meet the requirements of RS-422, RS-423, Federal Standards 1020 and 1030 for
balanced and unbalanced digital data transmission.
The QP26LS31 is designed to provide unipolar differential drive to twisted-pair or parallel-wire transmission lines. The
device provides both enable and disable functions common to all four drivers. It features tri-state outputs and logical
OR-ed complementary enable inputs. The inputs are all LS compatible and are all one unit load.
The QP26LS32 features an input sensitivity of 200mV over the input voltage range of ±7V while the QP26LS33 features
an input sensitivity of 500mV over the input voltage range of ±15V. Both provide and enable and disable function
common to all four receivers. Both feature tri-state outputs with 8mA sink capability and incorporate a fail-safe input-
output relationship that keeps the outputs high when the inputs are open.
The family is constructed using Advanced Low-Power Schottky processing.
QP Semiconductor products are not authorized for use in any space applications. The inclusion of QP Semiconductor
products in space applications implies that the space application manufacturer assumes all risk of such use and in doing
so indemnifies QP Semiconductor against all charges.
2945 Oakmead Village Ct, Santa Clara, CA 95051 • Phone: (408) 737-0992 • Fax: (408) 736—8708 • Internet: www.qpsemi.com