US 12,237,004 B1
Configurable, high speed and high voltage tolerant output driver
Yamin Du, Richmond Hill (CA); Vladimir Zlatkovic, Belmont, MA (US); Alex Alexeyev, Beverly, MA (US); and De Zhong Cheng, Nepean (CA)
Assigned to Synopsys, Inc., Sunnyvale, CA (US)
Filed by Synopsys, Inc., Mountain View, CA (US)
Filed on Aug. 26, 2022, as Appl. No. 17/896,996.
Claims priority of provisional application 63/237,291, filed on Aug. 26, 2021.
Int. Cl. G11C 11/4096 (2006.01); H03K 3/356 (2006.01)
CPC G11C 11/4096 (2013.01) [H03K 3/356113 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An output driver, comprising:
a first pullup driver comprising:
a first PMOS transistor having a source terminal coupled to a first supply voltage and a gate terminal receiving a first data; and
a second PMOS transistor having a source terminal coupled to a drain terminal of the first PMOS transistor and a gate terminal receiving a first analog signal;
a pulldown driver comprising:
a first NMOS transistor having a source terminal coupled to a second supply voltage and a gate terminal receiving a second data different than the first data; and
a second NMOS transistor having a source terminal coupled to a drain terminal of the first NMOS transistor, a drain terminal coupled to a drain terminal of the second PMOS transistor, and a gate terminal receiving a second analog signal; and
a first resistive element coupled between the drain terminal of the second NMOS transistor and a pad of the output driver.