US 12,237,043 B2
Apparatus and method for ZQ calibration
Yongseob Kim, Suwon-si (KR); and Taehyung Kim, Suwon-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Nov. 10, 2022, as Appl. No. 17/984,757.
Claims priority of application No. 10-2021-0154274 (KR), filed on Nov. 10, 2021; and application No. 10-2022-0047624 (KR), filed on Apr. 18, 2022.
Prior Publication US 2023/0142493 A1, May 11, 2023
Int. Cl. G11C 7/10 (2006.01); G06F 13/16 (2006.01); H03K 19/00 (2006.01)
CPC G11C 7/1048 (2013.01) [G06F 13/1668 (2013.01); H03K 19/0005 (2013.01); G11C 2207/2254 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A device comprising:
an output driver circuit connected to a signal pin, the output driver circuit interfacing with an external device over a channel via the signal pin;
a register control word (RCW) configured to store an output driver impedance parameter related to a pull-up output voltage (VOH) condition of the signal pin; and
an impedance control (ZQ) calibration circuit connected to the signal pin and configured to perform calibration using a VOH target level of the signal pin and control an output driver impedance at the signal pin connected to the channel.