Dell ST2420LB, ST2421L appendix Resolution, Video Supported Modes, Preset Display Modes, Electrical

Resolution

Model	ST2420L/ST2421L
Horizontal scan range	30 kHz to 83 kHz (automatic)
Vertical scan range	56 Hz to 76 Hz (automatic)
Maximum preset resolution	1920 x 1080 at 60 Hz

Video Supported Modes

Model

ST2420L/ST2421L

Video display capabilities (HDMI playback)

480i/480p/576i/576p/720p/1080i/1080p

Preset Display Modes

ST2420L/ST2421L

Display Mode	Horizontal Frequency	Vertical Frequency	Pixel Clock	Sync Polarity (Horizontal/Vertical)
	(kHz)	(Hz)	(MHz)
VGA, 720 x 400	31.469	70.087	28.3	-/+
VGA, 640 x 480	31.469	59.940	25.2	-/-
VGA, 640 x 480	37.500	75.000	31.5	-/-
VESA, 800 x 600	37.879	60.317	40.0	+/+
VESA, 800 x 600	46.875	75.000	49.5	+/+
VESA, 1024 x 768	48.363	60.004	65.0	-/-
VESA, 1024 x 768	60.023	75.029	78.8	+/+
VESA. 1152 x 864	67.500	75.000	108.0	+/+
VESA, 1280 x 1024	64.000	60.000	108.0	+/+
VESA, 1280 x 1024	79.976	75.025	135.0	+/+
VESA, 1920 x 1080	67.500	60.000	148.5	+/+

Electrical

Model	ST2420L/ST2421L
	Analog RGB, 0.7 Volts +/- 5%, positive polarity at 75 ohm input impedance
Video input signals	Digital DVI-D TMDS, 600mV for each differential line, positive polarity at 50 ohm input
	impedance
	HDMI, 600mV for each differential line, 100 ohm input impedance per differential pair
Synchronization input signals	Separate horizontal and vertical synchronizations, polarity-free TTL level, SOG
	(Composite SYNC on green)
AC input voltage/frequency/current	100 to 240 VAC/50 or 60 Hz + 3 Hz/2.0A (Max.)
Inrush iso surge current	120 V: 30 A (Max.)
	240 V: 60 A (Max.)

Physical Characteristics

Model	ST2420L/ST2421L
	•	D-sub: Blue connector
Connector type	•	DVI-D: White connector
	•	HDMI
	•	D-sub: Detachable, Analog, 15 pin, shipped attached to the monitor
Signal cable type	•	DVI-D
	•	HDMI